NEW Worcester Bosch 550 cdi

90.4% A

The Greenstar Highflow 550CDi boiler is a market leading energy-saving floor standing combi. It can deliver 25 litres of domestic hot water per minute, making the appliance ideally suited for use in large sized family homes, incorporating up to three bathrooms.

Greenstar condensing boilers deliver this energy-saving performance by recycling exhaust gases to extract and re-use latent heat - a highly efficient use of energy which also significantly reduces carbon dioxide in the atmosphere.

SEDBUK* A-rated efficiency - environmentally friendly
41.1kW DHW (domestic hot water) output, delivering 25 litres/minute flow rate**
Suitable for larger family homes with multiple bathrooms
Hot water and central heating temperature controls – consumer comfort and flexibility
Floor standing boiler
Multi-directional fluing including plume management
Mechanical, digital and radio frequency (RF) control options all available
Optimising 7-day programmable room thermostat available
24 hour programmable room thermostat available
2 year warranty on boiler with 10 year warranty on primary heat exchanger (subject to conditions)


*Seasonal Efficiency of Domestic Boilers in the UK
**Provided minimum mains water pressure at 1.7 bar is available

COMING SOON SOLAR & GROUND SOURCE HEAT PUMPS
(NO MORE GAS BILLS)

FAQs
What is sustainable energy?
Sustainable energy is best thought of as energy which can be replenished within a human lifetime and which causes no long-term damage to the environment.

Solar energy, wind energy, and geothermal energy, amongst others, are all self-sustaining. They all have sources that cannot be depleted. Extended use of these energy sources aids the conservation of other non-renewable energy sources such as fossil fuels.

How does a heat pump work?
The technology inside a heat pump works on similar principles to the way domestic fridge works. Heat pumps take advantage of the principles of thermodynamics in order to achieve their results. The diagram below offers pictorial explanation.

A water and glycol mixture is pumped around the collector circuit and causes the refrigerant in the evaporator to turn to a gas. This refrigerant passes through the compressor, causing the temperature to rise significantly. The hot gas moves to the condenser where it condenses and the latent energy is released into the heating circuit.



How is energy collected from the ground?
There are three options to obtain the energy from the ground.

In a horizontal collector lengths of pipe are buried underground to a depth of around 1 or 2 meters. This is a good solution if the property in question has enough land to accommodate the collector.

Worcester will be offering compact collectors which reduce the amount of space required for the collector.

An alternative to the horizontal collector types above is the vertical collector. A bore hole is drilled to a depth of between 60 and 200m and the collector is fed into the hole. A vertical collector minimises the amount of land required on the surface for a collector.

What is the COP?
The performance of a heat pump is often shown as the COP or Coefficient of Performance. This relates to the amount of energy that is extracted from the ground for each unit of energy used to run the pump.

A heat pump could provide between 3 and 5 kW of heat for each kW invested. The return is affected by the temperature achieved from the source and the heat required from the appliance to heat the property.

As an example if 3kW is provided by the electrically driven heat pump and 9kW is provided by the ground source the COP would be 4. This equates to the total energy provided, in this case 12kW, divided by the electrical energy from the heat pump, in this case 3kW, giving the COP of 4.

What types of heat pumps will be available?
Worcester will launch a heat pump system model for use with an external cylinder. The heat pump will be available in 6, 7 and 9kW variants.

Do I still need a boiler?
In contrast to solar thermal which requires a boiler back-up a heat pump, in most circumstances, should be able to provide all of the heating and water required for the home.

Can I keep my existing radiators?
Unless the radiators have already been oversized they will probably have to be replaced by larger ones.

What heat delivery method gives the best results?
Ideally a heat pump should be used with underfloor heating to maximise the efficiency of the system.

Is there any government funding available?
The Department of Trade and Industry is funding an initiative called Clearskies with which entitles home owners and not-for-profit organisations to financial help with a heat pump. Householders can apply for a grant of £1200. From April 2006 onwards the Clearskies scheme will be replaced by the Low Carbon Buildings Programme with similar funding levels available.

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The Greenstar 42CDi

90.1% A The Greenstar CDi boiler series is part of a market-leading range of energy-saving condensing gas-fired boilers from Worcester. They can cut heating and hot water bills by between 15-20% - and they’re up to 30% cheaper to run than an older boiler.

Greenstar condensing boilers deliver this energy-saving performance by recycling exhaust gases to extract and re-use latent heat - a highly efficient use of energy which also significantly reduces carbon dioxide in the atmosphere.

SEDBUK* A-rated efficiency - environmentally friendly
42kW domestic hot water output (27, 30 and 37kW outputs also available for this boiler - a product to suit all property types)
Hot water and central heating temperature controls - consumer comfort and flexibility
Mechanical, digital and radio frequency (RF) control options all available
Multi-directional fluing
Optimising 7-day programmable room thermostat available
24 hour programmable room thermostat available
Holiday function – frost protection and economic to run while you are away from home
Keep hot facility - instantly available hot water
Wall mounting frame housing pipes behind it - no exposed pipework
Fully condensing in both central heating (CH) and domestic hot water (DHW) modes
Low NOx and CO2 emissions - environmentally friendly
5 year** warranty with 10 year** warranty on primary heat exchanger

Getting the best out of your system

The boiler is the heart or the engine of any central heating system however, all the other components i.e. radiators, radiator valves and programmers etc., are all vital to the overall comfort levels required in the home.