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

If you’re looking for a combi boiler for your house or flat, you may wish to the consider the Worcester Bosch Greenstar 2000 25kW.

Traditional boilers have one or more large tanks in which they store either heated water or water to be heated later. Manufacturers originally introduced combi boilers to the market in the 1970s to enable homeowners to save space - UK residential properties are among the smallest in the Western world.

Combi boilers don't need these tanks because they draw water directly from the mains and instantly heat it on demand thanks to the technology inside the boiler. Combi boilers then distribute this hot water to your home’s taps and radiators when needed.

The most significant disadvantage of combi boilers is that they are not ideal in larger homes where multiple people might want hot water at the same time – for example, if someone is having a shower while another wants to wash dishes in the kitchen. This is because combi boilers have a maximum volume of water that they can heat. When two people want hot water at the same time, the water temperature, pressure and volume delivered to both points drop.

Is a Worcester Bosch Greenstar 2000 25kW combi boiler suitable for my apartment or house?

You should make sure that the boiler you choose for your property is the right "size". And size doesn't mean its physical dimensions. Size means how much power it has - the "output".

A boiler's output level measures how much power it can use to provide you with the hot water you need for your radiators and taps. If a boiler has a high output rate, it can heat greater volumes of water.

If you choose a boiler with too low an output, you'll find that the water coming out of your taps and in your radiators won't be as hot as you want it to be. Choosing one whose output is too high means you'll pay more than you need to for the gas your boiler needs to work.

The Worcester Bosch Greenstar 2000 25kW combi outputs at a maximum of 25 kW, so which types of property would this Worcester Bosch Greenstar 2000 25kW Combi boiler be appropriate for?

A PlumbProud Gas Safe boiler installer would recommend that this Worcester Bosch Greenstar 2000 25kW Combi boiler be installed in smaller homes and apartments with one bathroom and up to 10 radiators.

Homeowners considering fitting a combi boiler to their home need to consider flow rates as well as output rates.

The flow rate is a measurement of the volume of water a combi can instantly heat and send to the taps and radiators around your home. The higher the likely demand for hot water in your home, the higher your combi's flow rate should be. This Worcester Bosch Greenstar 2000 25kW Combi boiler's flow rate is 10 L/m.

Unlike heat only or system boilers, combi boilers don't store hot water in a tank for later use - instead, they draw it directly from the mains. This means that the volume of water your boiler can actually process is constrained by the flow rate of water in the mains pipe.

So, if you choose a combi boiler with a 15l/m flow rate but the flow rate in your mains pipe is 12l/m, the combi boiler's working flow rate is also 12l/m.

Combi boilers are also not always the correct choice for homes with multiple bathrooms, a high number of radiators, or where more than one family member will want to use hot water at the same time.

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.

What size is a Worcester Bosch Greenstar 2000 25kW boiler?

The Worcester Bosch Greenstar 2000 25kW is 724 mm in height, 400 mm in width and 300 mm in depth.

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

How does the Worcester Bosch Greenstar 2000 25kW combi rate environmentally?

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

14% of the total amount of greenhouse gases produced by the UK comes from the central heating systems we use. In some of Britain's biggest cities, gas boilers create dangerous levels of nitrogen dioxide in the atmosphere.

Would choosing the Worcester Bosch Greenstar 2000 25kW combi help the environment? Let's see what the statistics suggest.

All boilers manufactured and installed in the UK are required by law to have an energy efficiency rating of at least 92%, equivalent to a good “A” rating on the SEDBUK scale. Before this, the minimum was 88% (ratings of 88% and 89% are equivalent to a high “B” SEDBUK rating and anything 90% or higher is an "A" rating).

A boiler's energy efficiency rating is designed to let you know how much energy is used and wasted during normal functioning.

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

The ERP, short for the Energy Related Products Directive, is a European directive aimed at encouraging manufacturers to create products that are environmentally friendlier at all stages, including during manufacturing, when the product is in active use, right through to the point of final disposal.

The Worcester Bosch Greenstar 2000 25kW has a rating of "A" for heat and "A" for hot water production.

If the Worcester Bosch Greenstar 2000 25kW combi boiler breaks down, am I covered?

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