Making A Difference To Your Life, Your Fuel Bills And The .
Greenstar gas-fired condensingboilers from Worcester.Making a difference to your life,your fuel bills and the environment.1
The comfort of knowing that everyWorcester Greenstar boiler can saveyou money.2
Worcester is a market leader in high efficiency, condensingboiler technology and all of our products are designed todeliver heating and hot water comfort.Our Greenstar range of gas-fired condensing boilers canhelp reduce your fuel bills and your carbon footprint. Weare also leading the way in environmentally friendly heatingand hot water production through our commitment todeveloping innovative renewable energy solutions.Inside this brochure you should find all you need to knowabout the Worcester options available and how we can helpmake it easy for you and your qualified installer to find theright heating system for your home and lifestyle.ContentsPageWherever you live, Worcester keeps it feeling like home.4Worcester. Trusted for nearly half a century.5If your boiler is over 10 years old, it’s not as efficient as it could be.6Which type of condensing boiler is right for you?8Heating control options.16Greenstar gas-fired boiler technical overview.18Worcester. At your service.19We’re as committed to the environment as we are to our customers.20Even more ways of providing heating and hot water comfort to you.223
Wherever you live, Worcesterkeeps it feeling like home.It only feels like home if it’s warm and comfortableWhich is why the boiler you choose is so important.With Worcester, you have a boiler you can rely on year in, year out. As part of the BoschGroup, our products are designed and built to exacting standards, and constructed withonly the highest quality materials, to provide the levels of quality and reliability whichare synonymous with the Bosch name throughout the world. Every boiler is rigorouslytested before it leaves the factory, to ensure that it is fit for everyday use and meetsour customer requirements.So with annual maintenance, a Worcester condensing boiler will provide you and yourfamily with warmth, comfort and all-important peace of mind.Product testing at WorcesterThe Robert Bosch FoundationAs part of the Bosch Group, a percentage of the profits made by Worcester is donated to charities and good causes bythe Robert Bosch Foundation, a non-profit charitable trust. 92% of Bosch Group shares are held by the Robert BoschFoundation, helping the organisation as a whole to focus on long term activities, rather than concentrating on sharedividends. It means that you won’t see any companies associated with the Bosch Group on any stock markets. Since itsfounding in 1964, the Robert Bosch Foundation has spent 757 million on funding for social improvement initiatives.4
Worcester. Trusted for nearlyhalf a century.Worcester is the choice of millions ofQuality is the bedrock of thequality- and value-conscious householdsWorcester brandall over the UK – and it’s the choice ofthe heating industry too.Since 1962, when Worcester pioneereddomestic oil-fired boilers, the company’sInstallers voted Worcester’s Greenstarcommitment to excellence hasn’t changed.boilers CORGI’s Boiler of the Year 3 yearsAnd that commitment has only strengthenedrunning. Industry experts also recognisedsince Worcester became a part of the Boschthe Greenskies solar thermal panels,Group – one of the world’s leading names inawarding them CORGI’s Energy Efficientinnovative technology.Product of the Year.And a recent survey revealed that 9 out ofToday, many years and millions of boilers10 professional installers would chooselater, Worcester is the market leaderWorcester for their own homes*. All ofin domestic heating and hot waterwhich gives you the reassurance ofappliances, employing over 1,800 peopleknowing that when you invest in aat our headquarters and manufacturingWorcester product, its quality isplants in Worcester and at Clay Crossendorsed by the professionals.in Derbyshire – including a nationwidenetwork of over 300 directly employedService Engineers and over 40 technicaladvisors based at Worcester.All of this makes Worcester a name thatstands for reliability, quality, efficiency andvalue for money; a name you can trust.* Source: Worcester Customer Satisfaction SurveyWorcester, Bosch Group headquarters in Worcester5
If your boiler is over 10 years old,it’s not as efficient as it could be.6
A Worcester condensing boilercan reduce your fuel bill by 30%Changes to the Building Regulations in recent yearsWhy should I consider changing my boiler?mean that in virtually all new and replacement boilerIt’s surprising but true; older boilers can be as little asinstallations† a high efficiency condensing boiler must60% efficient and even many comparatively modern boilersbe used.are still only 70-75% efficient. Compare that to WorcesterGreenstar condensing boilersYour home’s energy ratingwhich are SEDBUK A-rated fortheir efficiency and more thanThe Energy Performance Certificate (EPC) is partof the new Home Information Pack (HIP), which is now90% efficient.required by anyone selling a home. It rates a home’s energyPut another way, with ourefficiency, giving potential buyers an idea of how green,condensing boilers more than 90por how costly, their new home will be. It is widelyof every 1 you spend on fuel forrecognised that installing a high efficiency condensingyour boiler is used effectively forboiler will improve your home’s rating.your heating and hot water.One more way to help improve the energy efficiency ratingWhat makes a condensing boiler so efficient?of your home, and to significantly reduce your fuel bills andcarbon dioxide emissions, is to install a solar water heatingCondensing boilers work by recovering the wastesystem. All Greenstar regular and system boilers can beheat which is expelled through the flue system of aused with a Worcester Greenskies solar water heatingnon-condensing boiler and passing it through a secondsystem to generate your hot water (see page 22).heat exchanger where it extracts additional heat*.Depending on the positioning of the solar panels, theycould provide up to 60%†† of your annual hot water freeThis is why it makes such good sense to switch to anof charge from a clean, renewable source of energy.award-winning Worcester boiler. With a boiler that’s 10Look for theyears old or more, which doesn’t have the benefit of today’ssolar compatible.symbol to indicate boilers which arecondensing technology, as much as 30%** spent on fuel foryour heating and hot water is wasted. It could make a bigWorcester Energy Housesdifference to your household energy bills, saving you moneyand help to reduce your carbon footprint at the same time.Worcester’s Energy Houses are real-life casestudies which show the difference that switchingAnd by combining a new condensing boiler with the latestto Worcester products can make to your bills,in digital heating controls, you can make your money goyour lifestyle and the environment.even further.MeasureCondensing boilerAnnualsaving ( /yr)Around 170CO2 saving aa yearAround 875kgHeating controls upgradeAround 105Around 530kgTotal savingsAround 275Around 1405kgYou can see how we could help you reduceyour energy consumption by ce: umptions* When operating in a condensing mode a visible plume is generated from the flue terminal. Consideration should be given to this when siting the boiler.Further details can be found within our Technical and Specification brochures on condensing boilers** Source: Energy Saving Trust † Exceptions can apply †† Energy Saving Trust (Publication CE102)7
Which type of condensing boileris right for you?It’s so simple to make your mind upThe lifetime of your boilerBecause every household is different – the heating andAll Worcester Greenstar gas-fired boilers are engineered tohot water needs of someone living in an apartment willlast – meaning you can think ahead about how your heatingbe very different from those with a large family home –and hot water needs may change. Whether you have aour Greenstar range is available in three boiler types:growing family or are thinking about adding solar water‘combi’, regular and system.heating in the future, you can choose the right Greenstarboiler now, secure in the knowledge that it will still beEach of the three types of boiler delivers all the benefits of highperforming if your circumstances change.efficiency technology, so you just need to weigh up which suitsyour needs, the size of your home and your lifestyle and it’sWarranties and spare partseasy to come to a decision on what’s best for you.All Worcester Greenstar gas-firedboilers come with a 2 year* warrantyThe easy way to chooseas standard and a 10 year* warrantyIt’s important that you find out as much as you can beforeon the primary heat exchanger.you decide on the boiler that’s right, so why not try thehelpful ‘find a boiler’ tool you’ll find on our website atFor added peace of mind we alsowww.worcester-bosch.co.uk /findaboilerhold spares for our boilers for atleast 10 years after they haveAlternatively you can call our customer helpline onbeen discontinued.08705 266241. It is also essential that you consult your GasSafe registered engineer or installer to help advise you onwhat boiler is most suitable for your property.* Terms and conditions applyConsiderations for choosing a new boilerConsiderationMost suitable boilerYou want to use your loft spacefor a room conversionor other purposeCombi orSystem (unvented cylinder)You live in a flat or bungalow(i.e. have very littleor no roof space)Combi orSystem (unvented cylinder)Your home has morethan 2 bathroomsRegular, System orfloor standing CombiYour mains waterpressure is lowRegular or SystemYou want to replace an oldboiler to improve an existingconventional central heating systemThere is a need to have hot wateravailable on tap without waitingfor it to heat upCombi, Regular or SystemCombiIf you need to discuss your boiler requirements,call our customer helpline on 08705 2662418
What is a ‘combi’ boiler?A ‘combi’ or combination boiler is a high efficiency waterheater and a central heating boiler combined (hence thename) within one compact unit. Water is heated directlyfrom the mains eliminating the need for a hot water storagecylinder and the associated cold water storage cistern in theroof space. Because your hot water is delivered to your tapsor shower at mains pressure it’s very convenient and cansave on your hot water costs. As an added benefit, showersfrom a ‘combi’ can be comparable with the performanceHot water to baths, showersand basins etcRoomthermostatof a power shower.Worcestercombi boilerwith programmerSo a ‘combi’ can also give you a little extra room to playwith, making it ideal for a flat or a bungalow with very littleor no roof space and it’s also the right choice if you wantto use your loft space for a room conversion. AnotherCold mainsCombi boiler layout‘combi’ benefit is that it can generally save you money oninstallation time and costs as well installation materials.‘Combi’ boilers are so popular that they account for twoout of every three new domestic boilers installed in Britainevery year.What is a regular boiler?Regular boilers – sometimes referred to as traditional orconventional boilers – are suitable for homes that alreadyWorcester solarthermal panelsFeed andexpansioncisternCold waterstorage cisternhave a traditional heating and hot water system that requiresa separate hot water cylinder. Regular boilers also require acold water storage cistern to feed the hot water cylinderand an expansion cistern in the loft. They are a good optionfor any home where a large volume of stored hot water isrequired e.g. homes with two or more bathrooms, or inHot water cylinderHot water tobaths, showersand basins etcProgrammerRoomthermostatWorcesterregular boilerareas where the water pressure is low. Regular boilers arecompatible with solar water heating systems to bring youthe added benefits of environmentally friendly hot waterRegular boiler layout and solar water heating systemand further cost savings.What is a system boiler?Worcester solarthermal panelsBoth a system boiler and a regular boiler work on theprinciple of stored hot water – but a system boiler is differentin two important ways. Firstly, many of the components of theheating and hot water system are built into the boiler itself,making it quicker and easier to install. Secondly, it doesn’tHot water cylinderHot water tobaths, showersand basins etcneed a feed and expansion vessel in the loft. There are twokinds of cylinder which this type of system may have –a mains pressure hot water cylinder or a low pressure hotwater cylinder. They are also compatible with solar waterRoomthermostatWorcestersystem boilerwith programmerCold mainsheating systems to bring you the added benefits ofenvironmentally friendly hot water and reduced hot waterand heating costs.System boiler layout and solar water heating system(System boiler with unvented hot water cylinder)Drawings are for illustrative purposes only9
Greenstar Si condensing combi boiler10Appliance shown with pipework behind trunking
Greenstar condensing combi boiler range.Greenstar 24i and 28i Junior seriesCentral heating outputs: Both models – 24kWHot water flow rates: 9.8 & 11.4 litres per minute* @ 35ºC temperature rise Our entry level wall-mounted combi boiler range for apartments and 1 bathroom properties Compact in size, i Junior combis can be installed in a number of locationsand can be used with a choice of mechanical, digital and wireless programmers.Greenstar 25Si and 30Si seriesCentral heating outputs: Both models – 24kWHot water flow rates: 10.2 & 12.3 litres per minute* @ 35ºC temperature rise Si combis are also suitable for apartments and small to medium sized 1 bathroomproperties, and offer slightly higher hot water flow rates than the i Junior series Si combis allow the hot water temperature to be controlled and can be usedwith a wider range of optional controls Si combis can also be installed in a variety of locations, including kitchens, utility rooms,bathrooms, airing cupboards, lofts or garages.Greenstar 27CDi, 30CDi, 37CDi & 42CDi seriesCentral heating outputs: 26kW (27CDi), 30kW (30, 37 and 42CDi)Hot water flow rates: from 11.1 to 17.2 litres per minute* @ 35ºC temperature rise Our ‘top of the range’ award-winning wall-mounted combi range, CDi appliances offera wide choice of operating features for greater user comfort and economy with theirhigher central heating outputs and increased hot water flow rates The higher output CDi combis can be suitable for larger two bathroom properties CDi appliances are unique in that they condense in both heating and hot water modesfor even greater efficiency and fuel savings. They also feature a modulating pump whichreduces electricity used by the pump by up to 30%Voted CORGI ‘Boiler of theYear’ for 3 years running An extensive choice of controls is available for use with CDi combis, includingsophisticated intelligent controls which provide the ultimate in user convenience,performance and economy.Greenstar Highflow 440CDi & 550CDi seriesCentral heating outputs: 29.2 & 30.6kWHot water flow rates: 20 & 25 litres per minute*† @ 35ºC temperature rise A choice of two floor-standing combis which have been developed specifically for largertwo bathroom properties where there is a heavier requirement for heating and hot water Highflow CDi combis incorporate many of the operating features of our wall-mountedcombis and can be used with mechanical, digital, wireless and intelligent controls.Please see pages 16-17 for compatible optional controlsWe always recommend you consult a qualified Gas Safe/CORGI installer prior to choosing your boiler.* Provided adequate mains pressure is available† Dependent on volume of hot water being delivered to taps. Refer to your installer11
Greenstar i System condensing system boiler12Appliance shown with pipework behind trunking
Greenstar condensing system boiler range.Greenstar 12i, 15i, 18i & 24i System series*Central heating outputs: 12, 15, 18 & 24kW With their compact, space-saving dimensions i System appliances are a good option forsmall to medium-sized properties with a heating system which includes stored hot water A choice of optional digital controls is available for use with all models in the series†.Greenstar 30CDi SystemCentral heating output: 30kW Our top performing system boiler for bigger properties with a larger heating requirement For added user comfort and economy the 30CDi System can be used with a choice ofdigital controllers† One button holiday mode or frost protection When combined with our new generation of intelligent controls and Greenskies solarfurther savings are achieved.Greenstar 30CDi System fascia with optional TD200 plug in controllerPlease see pages 16-17 for compatible optional controlsWe always recommend you consult a qualified Gas Safe/CORGI installer prior to choosing your boiler.* 15i and 18i System boilers available Autumn 2009† Provided the optional internal diverter valve is used13
Greenstar FS CDi condensing regular boiler14
Greenstar condensing regular boiler range.Greenstar Ri seriesCentral heating outputs: 12, 15, 18 & 24kW The smallest of our condensing appliances (they can be installed in a standardkitchen cabinet – see page 7 for example) There is an Ri appliance suitable for small, medium and larger properties Ri appliances have a fascia-mounted heating temperature control knoband neon operational status indicators.Greenstar CDi Regular seriesCentral heating outputs: 30 & 40kW Impressive heating outputs make CDi Regular boilers an excellentchoice for installation in larger properties Our top performing wall-mounted regular boiler with fascia-mountedheating temperature control knob and neon operational status indicators.Greenstar FS CDi Regular seriesCentral heating outputs: 30 & 40kW FS CDi Regular appliances are the ideal choice when replacing an older floor-standingboiler in a larger property or when a wall-mounted boiler is not an option The FS CDi Regular is compatible with the new flexible flue system which enables theflue to be routed through an existing brick chimney FS CDi Regular appliances have a fascia-mounted heating temperature control knoband neon operational status indicators.We always recommend you consult a qualified Gas Safe/CORGI installer prior to choosing your boiler.15
Efficiency that today’s energy-conscioushomeowner demands.Over the last few years boilers have become increasinglyWhichever you choose you can rest assured that it isefficient and, with condensing boilers already offeringdesigned to be easy-to-use to make sure you get the benefittypical efficiencies of over 90%, there is little scope forof being in full control of your heating and hot water.significant developments in boiler efficiency.The Worcester range of controls consists of:But the one area of the system where we can help improveperformance even further is in the controls.More effective controls can improve the overall performance ofyour heating system by as much as 13%*, dramatically reducingthe amount of fuel you use – and the amount you pay.Control optionsWorcester can offer you three different types of controlfor use with ‘combi’ and system boilers. These rangefrom simple-to-operate mechanical timers and moresophisticated digital programmers and room thermostats, MT10 mechanical timer MT10RF mechanical RF thermostat DT20 twin channel digital programmer DT20RF digital RF thermostat with twin channel programmer DT10RF digistat DT10RF optimiser TD200 text display RT10 room thermostat Intelligent system package for Greenstar 30CDi System FR10 Intelligent Room Thermostat FR110 Programmable Room Thermostat FW100 Weather Compensation Controller ISM1 Intelligent Solar Moduleright up to a new generation of intelligent controls.For further information on each of these controlsplease visit www.worcester-bosch.co.ukHeating controls – what are the differences?The majority of heating systems have at least two controls: a time clock or programmer and room thermostat. In fact,this is the minimum level of electrical controls specified by the Building Regulations for the installation of combi boilersand is a legal requirement. A timer or programmer operates the heating system to turn on for set periods of time. Dial and digital controls can beeither wall-mounted near to the boiler or attached to the fascia panel of the boiler. It will take at least 30 minutes foryour home to reach the desired temperature when the boiler fires up, depending on insulation levels and the outsidetemperature. The main difference between the two controls is a timer will operate the system at the same times everyday whilst a programmer allows different heating times for different days of the week to suit your lifestyle. A room thermostat controls the air temperature and is usually positioned in the hall or landing. The thermostat can beanalogue or digital. It should be sited away from direct sunlight and clear of curtains and furniture. As a guideline, yourthermostat should be set between 18ºC-21ºC for comfort temperature and 10ºC-12ºC for economy temperature. A programmable room thermostat allows you to programme the temperature levels to alter according to different times ofthe day and night. When programmed correctly this type of control prevents the system having to heat the house from a“cold start”. The control always maintains a temperature within the property (as decided by the user). This ensures thatthe boiler is only ever “topping up” the temperature in the home.16* Source: EuP Directive drafts
FEATURESRT10 Intelligentsystem package TD200FR10FR110FW100ISM1 Hard wiredRadio frequencyPlug in * All compatible controls must be used with optional internal diverter valve Boiler flow tempcompensationOptimum startProgrammableroom thermostatRoom thermostatAuto switch –BST/GMT7 day24 hourHot water Central heatingWall mountedFascia mountedIntelligent CDi SystemDT10RFoptimiser SYSTEM*i SystemDT10RF digistat COMBINATIONHighflow CDiDT20RF BOILER TYPEELECTRICALTEMPERATURE CONTROL CONNECTION TYPECDiDT20 TIME CONTROLSiMT10RFMOUNTi JuniorMT10DigitalControlMechanicalTYPE 17
The Greenstar condensing gas-fired boiler range.Technical specification and features overview.18Ri24Ri30CDi Conventional40CDi ConventionalFS 30CDiFS 42CDi12i System15i System18i System24i System30CDi System24i Junior28i Junior25Si30Si27CDi30CDi37CDi42CDiHighflow 440CDiHighflow WWWWWWWWWFFHeight 10710760760760760850850Width 00400440440440440600600Depth 30330360360360360600600Natural gasSEDBUK tic hotN/Awater flowrate @ 35 C 212.311.113.115.117.22025Central heatingoutput (kW)5.0 –15.06.0 –18.08.0 –24.07.7 30.09.4 –40.87.7 –30.09.6 –40.83.0 –12.05.0 –15.06.0 –18.07.2 –24.07.7 –30.07.2 – 7.2 –24.0 24.07.2 –24.07.2 –24.07.7 –26.27.7 –30.09.4 –30.09.4 – 7.4 –30.0 29.2 FeatureWall hung (W)Floor standing (F)4.0 –12.0Domestic hotwater control Condenses indomestic hotwater & centralheating modes9.7 –30.6 Max horizontalflue length (m)(100mm .64.610.07.06.56.04.04.0Max horizontalflue length (m)(125mm .018.513.013.013.013.023.016.016.012.013.013.0Max verticalflue length (m)(100mm .46.411.58.08.07.56.46.4Max verticalflue length (m)(125mm t findingdiagnostics Integral frostthermostat Integralpressure gaugeModulatingpump This matrix is for a guidance only, full technical details are available within the Technical and Specification brochuresfor these products and should be consulted prior to selection with the assistance of a qualified Gas Safe installer.* Boiler flow rates limited by regulators to give 40ºC ΔT. Minimum operating pressure required18
Worcester.At your service.We’re always on hand to help, whether you’re just startingWarranties for extra peace of mindto think about buying a Worcester boiler or you’ve ownedone for years. We have over 300 Service Engineers toTo give you even more reassurance, we offer comprehensiveensure our products deliver energy-saving performancewarranties on all our products. To find out more,year after year.visit www.worcester-bosch.co.uk/warrantyOur experienced and award-winning technical supportWhat is Gas Safe Register?team is also available on the phone or via email to offerhelp with any aspect of your Worcester boiler. They canGas Safe Register is the newhelp with choosing the right controls, as well as advisinghallmark for gas safety in Greaton combining your boiler with environmentally-friendly,Britain. From April 1st 2009,cost-saving renewable systems like solar water heating.Gas Safe Register replacedOf course, the advice of a qualified installer is alsoCORGI gas registration as theessential, and we can also help you find a professionalofficial gas safety body. So,installer who’s local to you. Just call 08705 266241from 1st April onwards, by law,or visit our website. You will also need to contact aonly Gas Safe registeredprofessional installer in order to purchase our productsengineers should carry outas due to their technical nature we only supply throughwork on gas appliances or installations in your home. Tothe trade.make sure that your gas-fired boiler is installed, maintainedand serviced safely you must employ a Gas Safe registeredengineer to carry out the work.19
We’re as committed tothe environment as weare to our customers.Whether it’s energy efficient boilers, or sustainable heatingour website at www.worcester-bosch.co.uk/greenerfuturesolutions, Worcester’s commitment to the environmentand, through a fun story, shows how we can all reduce ourgoes back many years.energy consumption and shrink our carbon footprint.The greatest contribution we make is by ensuring every oneWe’re also working with the Woodland Trust to helpof our products is as fuel efficient as technology will allow,reduce our own carbon footprint. For every Worcesteror uses completely sustainable fuel like solar energy.boiler installed, we’ll help plant a tree in the UK with theWoodland Trust. All you need to do is register your productBut that’s not all. In 2000, The Environment 2020 Awardsdetails at www.worcester-bosch.co.uk/plantatree and we’llwere initiated to celebrate and promote activities dedicateddo the rest.to conserving the environment for future generations. Theinitiative includes an annual children’s art competition.Making a differenceFor more information visit our website.Since 1996, the combined energy savings of all theWorcester is also behind a forward-looking scheme toproducts we’ve sold have helped reduce our company’seducate younger generations on environmental issues.carbon footprint by 20%, making a significant differenceA free book, ‘Picture a Greener Future’, is available fromto the UK’s impact on the environment.20
As domestic boilers currently account for21%* of the UK’s total CO2 emissions, thefact that a Worcester condensing boiler alsodelivers dramatically reduced emissions ofboth CO2 and NOx (Nitrogen Oxide) helpsin the battle against climate change. AllWorcester Greenstar boilers are withinclass 5 – the lowest of the 5 categories –for NOx emissions.* Source: Energy Saving Trust21
Even more ways of providing heating andGreenskies solar water heating panels22
hot water comfort to you.Greenstar oil-fired and LPG boilersGreensource air to water and air to air heat pumpsFor homes that are not connected to mains gas, allThese clever devices are used extensively in Scandinaviaof our gas-fired boilers are available as LPG models.and use latent energy stored in the air to provide heatingand hot water for the home.Worcester also manufactures a range of high-efficiencyoil-fired Greenstar boilers, that provides the same costsaving benefits.Greensource airto air heat pumpGreenskies solar water heatingComplementing Greenstar regular and system boilers,Greenskies solar water heating can provide up to 60%*of your annual hot water needs. Our solar water heatingpanels do not rely on high temperatures or direct sunlightto work. Even on cloudy days, they can deliver significantenergy savings. That's because they work on the principle oflight absorption, rather than needing heat or direct sunlight.Greenstore ground source heat pumpsInformation whenever you need itGreenstore ground source heat pumps can meet your totalheating and hot water needs by using the latent heat storedTo help you make the most of your heating and hotin the earth. Ground source heat pumps are perfect forwater system, Worcester has produced an informativeuse with under floor heating systems and can also be‘handy hints’ guide. To obtain a copy or to find outused with appropriately sized radiators.more about Worcester’s full range of heating and hotwater solutions, visit www.worcester-bosch.co.ukor call our literature line on 01905 752556. 2,000 cash-backon Greenstore groundsource heat pumpsuntil end of 2009.Visit www.worcesterbosch.co.uk/cashforgshpfor more details.Greenstorecombination andsystem groundsource heat pumps* Source: Energy Saving Trust (Publication C
than 2 bathrooms floor standing Combi Your mains water pressure is low Regular or System You want to replace an old boiler to improve an existing Combi, Regular or System conventional central heating system There is a need to have hot water available on tap without waiting Combi for it to heat up Considerations for choosing a new boiler
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Applications of the Sum and Difference Identities Verifying an Identity 5.4 Sum and Difference Identities for Sine and Tangent 341 Sum and Difference Identities for Sine Sum and Difference Identities for Tangent Applications of the Sum and Difference Identities Verifying an Identity Chapter 5 Quiz (Sections 5.1– 5.4) 350
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