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

If you are considering installing a combi boiler in your house or flat, then the Worcester Bosch Greenstar 2000 25kW boiler is certainly worth investigating.

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 house or flat?

It's best to choose a boiler whose size or "output" is right for your property. With a boiler, however, size does not mean how big the boiler is, it means how much power it has.

The amount of hot water you get from showers, bathrooms, and sinks and heat from your radiators depends on your boiler's output (measured in kilowatts). The higher the level of output, the better your home will be heated and you can be more certain that the water from your taps will be as hot as you want.

However, you must be careful. You might not get the hot water you want if your boiler output is too low. If it's too high, you'll be paying more than you need to for gas.

With the Worcester Bosch Greenstar 2000 25kW combi's output at 25 kW, which types of property would this Worcester Bosch Greenstar 2000 25kW Combi boiler be most appropriate for?

Most experienced boiler engineers would recommend this Worcester Bosch Greenstar 2000 25kW Combi boiler as a suitable option for smaller homes and apartments with no more than up to 10 radiators and one bathroom.

Flow rates are important when choosing a combi boiler as well as output rates.

A combi boiler's flow rate (measured in litres per minute) describes how much water it can instantly heat then distribute to the taps and radiators in your home - you will need to factor this into your decision on a new combi boiler. This Worcester Bosch Greenstar 2000 25kW Combi boiler's flow rate is 10 L/m.

If you have a lot of radiators and bathrooms in your home and there's lots of demand within your household for hot water at the same time (like morning or evening showers and baths), you'll need a boiler with a high flow rate.

However, it's not quite that simple. If your local mains water pressure is low, you're not going to gain any benefit from choosing a combi boiler with a high flow rate because that higher flow rate doesn't mean it can draw more water from the mains pipes.
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 the Worcester Bosch Greenstar 2000 25kW boiler?

The Worcester Bosch Greenstar 2000 25kW boiler is 724 mm high, 400 mm wide, and 300 mm deep.

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

Is choosing the Worcester Bosch Greenstar 2000 25kW combi boiler environmentally friendly?

How we heat our homes and the effect that has on climate change has become important to many homeowners worried about the environment.

Dangerous levels of nitrogen dioxide emissions in larger UK cities are caused by gas boilers in domestic properties, and 14% of the UK’s greenhouse gas production is as a result of central heating.

Will choosing to install a Worcester Bosch Greenstar 2000 25kW combi in your home help the environment? Let's review the figures.

By law, the minimum level of energy efficiency for boilers manufactured in the UK is 92%, equivalent to a good SEDBUK “A” rating. Prior to April 2018, the minimum was 88% - boilers whose energy efficiency levels were 88% or 89% were given a "B" rating on the SEDBUK scale and those at 90% or higher were given an "A".

The energy efficiency rating awarded to each boiler indicates the amount of energy that is wasted when in operation.

Following testing, the Worcester Bosch Greenstar 2000 25kW was given a 93% energy efficiency rating and a SEDBUK grading of "A".

The Energy Related Products (ERP) Directive is a European directive which applies to all products that consume energy over their lifetime.

It encourages companies to create products that are environmentally friendlier at all life cycle stages, including initial manufacturing and end use through to final disposal, with the aim of reducing harmful gas emissions.

The Worcester Bosch Greenstar 2000 25kW is rated "A" for heat and "A" for water.

How long is the warranty period on the Worcester Bosch Greenstar 2000 25kW combi boiler?

The Worcester Bosch Greenstar 2000 25kW is covered by a parts and labour warranty of 5 years following installation.