Is the Worcester Bosch Greenstar 2000 25kW a standard, combi or system boiler?

The Worcester Bosch Greenstar 2000 25kW may be worth considering if you are looking for a combi boiler for your house or flat.

In older British homes, traditional boilers required you to find room for one or more storage tanks. One tank would keep hot water warm and the other stored cold water for later heating. Manufacturers introduced combi boilers to the UK in the 1970s so that homeowners could get the warmth and hot water they needed without having to sacrifice too much valuable space – remember that residential property in this country is among the smallest in the Western world.

Combi boilers deliver hot water to your radiators and taps using water they draw directly from the mains supply. As mains water travels through a combi boiler, the technology within it heats the cold water instantly and on demand. The hot water is then distributed throughout your house.

Combi boilers have one drawback, however: they can only heat a certain amount of water within a given time. For example, if someone uses the shower and another person uses the hot water tap at the same time, water pressure drops because water reaches each point differently.

Is the Worcester Bosch Greenstar 2000 25kW combi boiler a suitable choice for my property?

It's best to choose a boiler whose size or "output" is right for your home.

The more hot water and heat you want, the higher the output level of your boiler should be. Output is measured in kilowatts and it describes the maximum level of power your boiler has to heat water.

If your output level is too low, your boiler will not have the power it needs to get your water as hot as you want it, particularly when there's a lot of demand for it. Choose a boiler whose output level is too high and you'll have all the hot water you need but will be paying too much for it through higher gas bills.

Which types of property would this Worcester Bosch Greenstar 2000 25kW Combi boiler be appropriate for given its output of 25 kW?

Most experienced heating engineers would likely recommend that, at this level of output, this Worcester Bosch Greenstar 2000 25kW Combi boiler would be a suitable choice for smaller homes and apartments with up to 10 radiators and one bathroom.

The Worcester Bosch Greenstar 2000 25kW is a combi boiler, which that means that you need to take the flow rate (measured in litres per minute) into account as well as the output rate. This Worcester Bosch Greenstar 2000 25kW Combi boiler's flow rate is 10 L/m.

Combis draw water from the mains, instantly heating and distributing it where it's needed - taps, radiators, bathrooms, and so on.

However, this means that the flow rate of a boiler may effectively be capped by the flow rate of the mains water supply. For example, if your mains pressure is 12l/m, that is the maximum flow rate that your boiler can achieve even if you choose a boiler with a flow rate of 18l/m.

In addition, if your home has more than one bathroom, a high number of radiators, and more than one member of your household wants to use hot water at the same time regularly, the flow rate of both the boiler and the mains water pressure may not be high enough.

When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead if your family's demand for hot water is higher than normal.

Worcester Bosch Greenstar 2000 25kW - size in millimetres

The dimensions of the Worcester Bosch Greenstar 2000 25kW are 724 mm tall, 400 mm wide, and 300 mm deep.

Is the Worcester Bosch Greenstar 2000 25kW condensing or non-condensing?

How environmentally friendly is the Worcester Bosch Greenstar 2000 25kW combi?

How we heat our homes has become a major issue for many people worried about climate change and environmental issues in general.

Central heating accounts for 14% of greenhouse gas emissions in the UK. In larger British cities, gas boilers emit dangerous levels of nitrogen dioxide into the atmosphere.

Would installing the Worcester Bosch Greenstar 2000 25kW combi in your home be an environmentally friendly decision? Let's look closely at the figures.

Every boiler manufactured and supplied in the UK must have an energy efficiency rating of 92% (SEDBUK “A” rating). These minimums were made law in April 2018 - before that, the minimum energy efficiency rating was 88% (88%/89% = "B" SEDBUK grade, 90%+ = "A" SEDBUK grade).

The Worcester Bosch Greenstar 2000 25kW was awarded an efficiency rating of 93% and a band rating of "A".

Energy efficiency ratings for boilers describe the amount of energy they use and waste when switched on and working.

The ERP (or Energy Related Products Directive) is a European regulation governing products which require energy to operate throughout their lives and encourages manufacturers to create products that are more environmentally friendly.

The legislation is designed to reduce the potential for harmful gas emissions during manufacturing and actual use right through to the point of final disposal.

For the Worcester Bosch Greenstar 2000 25kW, the ERP rating is "A" for heat and "A" for hot water production.

If the Worcester Bosch Greenstar 2000 25kW breaks down, will I be covered by the warranty?

The manufacturer offers a parts and labour warranty of 5 years on the Worcester Bosch Greenstar 2000 25kW boiler to new customers.