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17Compact and space saving,combi boilers are veryreliable as well as highlyenergy-efficient makingthem economical to run.Greenstar combi boilers.Combi boilers are the most popular heating and hot water solution in the UK. Over15 million have been fitted across the country and they are now the preferred choicefor most householders and installers. Worcester was the pioneer of the combi boilerin the UK, with the Greenstar range developed to suit virtually all homes.Energy saving and convenientAll Worcester Greenstar combis are designed and manufacturedto provide high levels of performance and operating efficiency.This is achieved through features such as the ‘keep hot’ facilitywhich ensures that hot water is almost instantly availablewhenever it’s required.The boilers also incorporate a special ‘ECO’ mode button whichcan be used to over-ride the ‘keep hot’ facility. This has the bonus ofusing less gas, as energy is only used when hot water is required.For added efficiency, models such as the Greenstar CDi Classic,Greenstar CDi Compact and Greenstar Si Compact condense inboth hot water and heating modes.

18Greenstar CDi ClassicseriesGreenstar CDi CompactseriesGreenstar Si CompactseriesOur top of the range Greenstar CDi Classiccombis are high performance boilers suitablefor small, medium and large-sized propertieswith one or two bathrooms. Known for theirexceptional efficiency and reliability, they arewall-mounted and offer the highest levels ofhot water comfort.The wall-mounted Greenstar CDi Compactseries have the smallest dimensions of ourcombi boilers. They can be installed in a widerange of locations, including inside a standardkitchen cupboard. Despite their small size,high outputs can make them suitable forproperties with more than one bathroom.Greenstar Si Compact combis are suitablefor small to medium-sized one bathroomhomes. They can be wall-mounted in a varietyof locations, including a kitchen cupboard,utility room, bathroom, airing cupboard,loft or garage.Hot water output: 30.9, 35, 40 and 42kWHot water flow rates: from 12.3 to17.2 litres per minute dependingon model.Hot water output: 28, 32 and 36kWHot water flow rates: from 11.4 to14.7 litres per minute dependingon model.Hot water output: 25 and 30kWHot water flow rates: from 10.2 to12.3 litres per minute dependingon model. Larger two bathroom properties can besupplied by higher output options The CDi Classic has set the heatingindustry benchmark for efficiency, helpingto reduce gas bills Low energy pump reduces electrical usage Frost protection reduces frost risk ifinstalled in a garage or loft Wide choice of matching controls enablesgreater comfort and economy. User-friendly displays make boiler easyto operate Can be installed in a kitchen cupboard High efficiency, greater reliability anddurability is achieved by the CDi Compact‘sinnovative new heat exchanger Wide choice of matching controls enablesgreater comfort and economy. Hot water can be adjusted to fine tuneyour comfort Wide choice of matching controls enablesgreater comfort and economy Frost protection is also included on theSi Compact, reducing frost risk if installedin a garage or loft.1. Heating and hot waterfrom one compact unit4. Constant, controllabletemperature2. Instant hot water,always available5. You only pay to heatwater as you use it7. No risk of frozen pipesor tanks, or leaks inthe loft3. Saves energy and costs6. Saves spaceWhy a combi boiler?8. Fewer components usuallymeans faster installationWe always recommend you consult a qualifiedGas Safe installer prior to choosing your boiler.

19Greenstar i JuniorseriesGreenstar Highflow CDiseriesThe popular i Junior series represent1 in 10 of all boilers installed in the UK.These wall-mounted boilers are ideal forapartments and small to medium-sizedproperties with one bathroom.These floor-standing combi boilers havebeen developed specifically for larger twobathroom properties where there is a needfor higher heating and hot water outputs.Worcester is the only company thatproduces a combi boiler of this kind.Hot water output: 24 and 28kWHot water flow rates: from 9.8 to11.4 litres per minute dependingon model.Hot water output: 29.5 and 41.1kWHot water flow rates: from 20 to 25 litresper minute depending on model. Hot water can be adjusted to fine tuneyour comfort Wide choice of matching controls enablesgreater comfort and economy. Larger two bathroom properties can besupplied by higher output options Wide choice of matching controls enablesgreater comfort and economy Frost protection and condensate pumpreduces frost risk if installed in a garageor cellar.Do you require very highamounts of hot water?A Greenspring instantaneous water heater is ahighly efficient alternative to storing hot water ina separate cylinder. It offers up to 28.8 litres perminute of hot water making it the perfect solutionfor large domestic as well as small, medium andlarge commercial applications that use multiplesinks, baths and showers. Please note theGreenspring water heater will only provide hotwater and will not heat your property.Greenstar combi boilersare complemented by ourwide range of controls andprogrammers to help you saveeven more money and energy.See pages 30-37 for furtherinformation.

20System boilers provide plentyof hot water to multiple tapsat the same time and do notneed any tanks in the loft.Greenstar system boilers.Greenstar system boilers are known for their high quality and reliability, making themrobust enough to stand up to the highest of heating and hot water demands.Efficient and economicalUltra efficient and economical to run, Worcester system boilersincorporate many of the heating and hot water componentsfound in a traditional heating system, making installationless disruptive and neater.Space saving and attractiveThe compact size of Greenstar i System boilers means that they canfit perfectly into many locations, with the 27kW and 30kW modelseven fitting into a standard kitchen cupboard. With a smart design,they’ll also look great in your home, whether alongside cupboardsor placed on their own.Perfect partnersWorcester system boilers can be used with a wide choice ofoptional controls to maximise comfort and energy savings, and arealso perfectly matched to our comprehensive range of Greenstorehot water cylinders. Choosing a complete Worcester system willensure you will have a highly efficient solution and the opportunityto get a comprehensive 5 year guarantee across your entire system*.System boilers are also compatible with our Greenskies solarwater heating systems, which can be installed at the same time asthe boiler or easily retrofitted in the future to reduce your energybills even further.* Terms and conditions apply.

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22Greenstar CDi Classic System seriesGreenstar i System (27kW and 30kW)The wall-mounted Greenstar CDi Classic System series arehigh performance, high efficiency boilers that suit biggerhomes with larger heating and hot water needs. They arecompatible with a wide range of optional controls for evengreater time and temperature setting flexibility as well asadded energy savings.The 27kW and 30kW Greenstar i System boilers are anew generation of smaller and lighter wall-mountedboilers. Suitable for small, medium and large homesthey incorporate all the benefits of Greenstar i Systemseries but offer higher heating output options to suithomes where demand is greater.Central heating output: 30kW and 34kWCentral heating output: 27kW and 30kW Stored hot water can be rapidly replenishedwith high output options The CDi Classic has set the heating industry benchmarkfor efficiency, helping to reduce gas bills Low energy pump reduces electrical consumption Frost protection reduces frost risk if installedin a garage or loft Can be used with Worcester controls and Greenskiessolar panels for energy and cost savings. Can be installed in a kitchen cupboard User-friendly displays make boiler easy to operate High efficiency, greater reliability and durability isachieved by the innovative new heat exchanger that isfeatured in the 27kW and 30kW models Can be used with Worcester controls and Greenskiessolar panels for energy and cost savings.Why a system boiler?1. Hot water supplied evenly3. Wide range ofto all taps at the same timeoptional controls5. Energy efficient forlower fuel bills2. No need for separatepump and loft tanks6. Compatible withGreenskies solarwater heating systems4. No risk of pipes ortanks in the loftleaking or freezingWe always recommend you consult a qualifiedGas Safe installer prior to choosing your boiler.

23Greenstar i System seriesThe ultra efficient Greenstar i System series are our mostpopular wall-mounted system boilers. They offer flexibilityand can be installed in a number of locations.Central heating output: 12kW to 24kW Suitable for homes where the heating systemincludes a hot water storage cylinder All system components are neatly containedwithin the boiler Can be used with Worcester controls and Greenskiessolar panels for energy and cost savings.Want hot water providedby the sun?For more information on Greenskies solar thermalalpanels see page 45 or visit our website.For more information on Greenstore cylinderssee pages 28-29.Worcester system boilersand Greenstore unventedhot water cylinders offerthe perfect combination forplentiful, efficient hot water.

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25Regular boilers meet all theheating demands of everysize of home and are an idealenergy-efficient replacementfor an existing boiler.Greenstar regular boilers.With quality and reliability at the heart of every Worcester regular boiler, they arerobust enough to deliver efficient heating and hot water year after year.Modern efficienciesWith over 90% efficiency, Greenstar regular boilers will helpreduce your energy bills and your carbon footprint. They canenhance heating and hot water performance in all sizes of homes,including those with two or more bathrooms, and where mainswater pressure is low.Small in statureThe compact size and smart design of Greenstar regular boilersmeans that they will look great in any home, with several optionsreadily fitting into a standard kitchen cupboard. Replacementinstallation typically is simple and straightforward, which keepscosts down and disruption at a minimum.Worcester regular boilers also perfectly meet the need forlarge hot water requirements. For example, two bathrooms can becomfortably used at once with no loss of pressure or temperature.They can also be combined to cater for high water demand inproperties with three or more bathrooms. In this scenario, twoboilers would work together to ensure a rapid re-supply of hotwater despite the large volumes of water involved.Solar compatibleAll of our regular boilers are compatible with our Greenskies solarwater heating systems which can help to reduce your energy billswhilst also benefitting the environment.

26Greenstar CDi ClassicRegular seriesGreenstar Ri(27kW and 30kW)Greenstar RiseriesThese top-performing, wall-mountedboilers have impressive heating outputsmaking them an excellent choice forlarger properties.The higher output wall-mounted Greenstar Ri27kW and 30kW boilers meet all the heatingand hot water needs of medium to largeproperties, whist their compact size makesthem small enough to be installed ina standard kitchen cupboard.These compact, wall-mounted boilers aresmall enough to be installed in a standardkitchen cupboard and are a great option forsmall and medium-sized homes.Central heating output: 30kW and 40kWCentral heating output: 27kW and 30kWCentral heating output: 12kW to 24kW Stored hot water can be rapidly replenishedwith high output options The CDi Classic has set the heatingindustry benchmark for efficiency,helping to reduce gas bills Low energy pump reduces electricalconsumption Frost protection reduces frost risk ifinstalled in a garage or loft. User-friendly displays make the boilereasy to operate Can be installed in a kitchen cupboard High efficiency, greater reliability anddurability is achieved by the innovativenew heat exchanger that is featured inthe 27kW and 30kW models. Suitable for homes where theheating system includes a hot waterstorage cylinder Can be installed in a kitchen cupboard Frost protection is also included on theRi, reducing frost risk if installed in agarage or loft .Why a regular boiler?1. Compatible witholder pipeworkand radiators2. Options for verycompact spaces3. Improved heating and hotwater performance5. Simple and straightforward installation4. High efficiency for lowerenergy bills and reducedcarbon footprint6. Compatible withGreenskies solarhot water systemsWe always recommend you consult a qualifiedGas Safe installer prior to choosing your boiler.

27Greenstar FS CDi RegularseriesThe floor-standing Greenstar FS CDi Regularseries boilers are an ideal replacement foran older floor-standing boiler in a largerproperty or when a wall-mounted boileris not an option.Central heating output: 30kW and 40kW Stored hot water can be rapidly replenishedwith high output options Can be used with Worcester’s uniqueflexible flue system that can be routedthrough a brick chimney. An ideal benefit ifyou are replacing an old back boiler. Frost protection and condensate pumpreduces frost risk if installed in a garageor cellar.Greenskies solar thermalpanels and Worcester regularboilers are perfect partnersfor efficient hot water. Whenused together, they can provideup to 60%* of a home’s hotwater requirements.* Source: Energy Saving Trust.Want hot water providedby the sun?For more information on Greenskies solar thermalalpanels see page 45 or visit our website.For more information on Greenstore cylinderssee pages 28-29.

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29Super efficient cylinders canhelp lower your energy billsand carbon emissions. Theyare highly insulated to reduceheat loss and energy wastage.Greenstore cylinders –transforming hot water storage.When a system or regular boiler is installed, there will always be a requirement for ahot water cylinder. Hot water is provided by taking heat from the boiler and pumpingit through the central heating system to the cylinder where the heat is transferredvia the cylinders heat exchange coils. This water is then stored ready to be passedthrough taps and showers when required.Older, non-insulated cylinders tend to lose a considerable amount of heat and arelikely to have a build-up of limescale, which reduces efficiency and makes water heat-uptimes longer. Even insulated cylinders over 10 years old lose more heat than modern ones.Greenstore unvented cylinders have been designed to offer significant performanceimprovements over traditional cylinders. They combine rapid re-heat times with excellentheat retention and are guaranteed for 25 years.* They also come in a wide range of capacities,from 90 to 300 litres, so you can be sure of a size that’s exactly right for your home and lifestyle.Greenstore unvented cylinders: Made for modern livingThe Greenstore unvented cylinder range is a perfect complement for Greenstar regular orsystem boilers. Hot water is supplied at mains pressure for powerful showers and fast bathfilling, and multiple taps can be used at the same time without the hot water running out.If your mains water pressure is low, you can still benefit from the high performance, fastreheat times and energy savings of Greenstore Cylinders. A trained Worcester installerwill be able to provide solutions to increase your water performance if needed.65mmGreenstore unvented solar cylinders: The future-proof choiceGreenstore solar-compatible unvented cylinders are specifically designed to work withour Greenskies solar water heating systems. With all the same benefits as our standardunvented range, they enable you to add solar water heating to your system at a later datewith no need to replace the cylinder. Available in five capacities, from 150 to 300 litres,they provide highly efficient storage for both boiler and solar-heated hot water.* Terms and conditions apply.With 65mm of Expanded Polystyrene, theinsulation level on Greenstore cylindersis the thickest in the UK market.

30Worcester keepsyou in control.

31Boiler controls make a big difference to your heating system. With our condensingboilers already operating at peak efficiency, our range of controls give you anadditional way of boosting your system’s overall performance.Worcester boiler controls give you ability to precisely manageyour system, as opposed to older controls which simply turn yourboiler on and off. By completing your Worcester system with amatching Worcester control, you can fine tune your comfort levelswhilst also working to reduce your gas use, so that you only pay forwhat you need when you need it.Options for everyoneOur easy to use controls include everything from traditionalmechanical clock timers to internet-connected smart controls thatcan be managed from anywhere in the world. Simple mechanicalclock timers switch your boiler on and off at the times you select,with the same times repeated every day. Digital controls giveyou more options, enabling you to set different times for differentdays of the week, which can be particularly useful for weekends.Intelligent controls achieve considerable energy savings andtherefore lower bills. As well as responding to your time settings,they include clever features such as an ability to monitor outdoortemperatures and adjust the boiler’s output to make it more fuelefficient. The Wave, our new smart control, has even more controland efficiency features that can be operated remotely using acompatible smart device.

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33Worcester controls aredesigned to not only enhancea boiler’s efficiency butincorporate features thatwork around your lifestyle.Controls for a heating and hot water system typically include two main elements:a time clock or programmer and a room thermostat. Here we explain the differenttypes that we offer and what they do. We also highlight what load and weathercompensation

Solar thermal panels Radiators Room thermthermostatostat Boiler Cold mains feed System and regular boilers are perfect partners for Worcester Greenskies solar hot water systems (also known as solar thermal). In a solar thermal system, the panels harness heat from the sun, which is used to heat the water stored in a solar compatible hot water .