Is the Worcester Bosch Greenstar Heatslave II 25/32 boiler a standard, combi or system model?

The Worcester Bosch Greenstar Heatslave II 25/32 may be worth considering if you are looking for a combi boiler for your house or flat.

In the past, most boilers needed one or more storage tanks to operate - one to store warm water and the other for storing water to be heated later. But storage tanks are problematic in properties where space is at a premium and particularly where there is no loft. Many properties in the UK are small and so manufacturers introduced combi boilers in the 1970s to eliminate the need for tanks.

With a combi boiler, the hot water for your radiators and taps is delivered on demand. The boiler instantly heats water it draws directly from the mains internally. It then distributes the heated water around your home at mains pressure as you need it.

It is important to bear in mind that, while combi boilers have many benefits, they can only heat a certain volume of water at any given time. This means that, if you run a shower at the same time as someone else is doing the washing up in the kitchen, the volume of water passing to each point will drop, causing a fall in pressure.

Is a Worcester Bosch Greenstar Heatslave II 25/32 combi boiler right for my house or apartment?

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

Your boiler should be able to cope with peak hot water demand in your property and not just your average hot water usage. The output rate of a boiler is measured in kilowatts and tells you how much power a boiler can use to provide hot water to your taps, showers and radiators.

If the output of your boiler is too low, there will often be times when your water isn't as hot as you want. But if your boiler output is too high, it will be more costly to run (often unnecessarily).

The output of the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler is 32 kW kilowatts. Which types of property would this be appropriate for?

Most experienced boiler engineers would recommend that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler would be suitable for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

With combi boilers, you need to consider the flow rate as well as the output rate. The flow rate (shown in litres per minute) measures how much water your boiler can draw from the mains which it then instantly heats and distributes to your taps and radiators.

However, a high flow rate is of little to no value if your local water pressure is low. If your local mains water pressure is 10l/m and your flow rate is 12l/m, your boiler will only be able to process 10l/m.

If you live in an area with high water pressure but your household has multiple bathrooms and/or radiators and many members of your household want to use hot water at the same time (like morning or evening baths or showers), it's unlikely that you'll be able to find a combi with a high enough flow rate.

As an indication, a power shower needs about 10 litres of water per minute, whereas the flow rate of this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler is 22 L/ml/m.

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 Heatslave II 25/32 size

The size of the Worcester Bosch Greenstar Heatslave II 25/32 boiler is 855 mm high, 520 mm wide, and 600 mm deep.

Many homes in the UK still have floor-standing boilers like the Worcester Bosch Greenstar Heatslave II 25/32, even though wall-hung boilers have become the product of choice for most homeowners over the last 20 years. If you'd like to replace your existing floor-standing boiler with a compact, wall-mounted boiler to create more space for you and your family, please bear in mind that your pipework may need to be replaced in addition to the cost of the boiler and its installation.

Savings on your oil bills will eventually completely pay for the one-time investment but it will take a few years.

If you replace an existing heat only or system boiler with the Worcester Bosch Greenstar Heatslave II 25/32, you will also need to remove your hot water cylinder and/or expansion tank.

Please contact PlumbProud for information and guidance on the best course of action.

Is this Worcester Bosch boiler condensing or non-condensing?

The Worcester Bosch Greenstar Heatslave II 25/32 is a condensing oil boiler - where possible, we always recommend to clients that they choose one of the very latest condensing boilers to take advantage of this technology, which improves year after year.

Condensing boilers are more energy-efficient as they capture and recycle the heat contained in flue exhaust gases and water vapour condensation. They then use this heat to perform tasks like warming up colder water returning to the boiler from the radiators.

By choosing a condensing boiler, you'll help the environment as well as save money on your oil bills.

How does the Worcester Bosch Greenstar Heatslave II 25/32 combi rate environmentally?

With environmental issues in the spotlight, more and more homeowners are becoming concerned about how they heat their homes and how much they're contributing towards combatting climate change.

About 14% of the greenhouse gases we produce in the UK come from the power needed for central heating. In bigger British cities, gas boilers are a significant source of nitrogen dioxide emissions.

Do the figures suggest that installing the Worcester Bosch Greenstar Heatslave II 25/32 combi at your property would help in the fight against climate change?

Boilers manufactured or supplied to UK domestic properties must achieve a legal minimum energy efficiency rating of 92% (equivalent to a good "A" grade using the SEDBUK scale). Prior to this, the minimum was 88% (88% and 89% are a "B" SEDBUK grade and anything 90% or above is an "A" grade).

The energy efficiency rating of a boiler refers to the amount of energy it uses to perform its everyday functions as well as the amount of energy it wastes.

The Worcester Bosch Greenstar Heatslave II 25/32 has been given a rating of 91% for energy efficiency, equivalent to a SEDBUK "A" rating.

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 Heatslave II 25/32, the ERP rating is "A" for heat and "B" for hot water production.

What is the warranty period on a Worcester Bosch Greenstar Heatslave II 25/32 combi boiler?

You receive a parts and labour warranty of 2 years with the Worcester Bosch Greenstar Heatslave II 25/32 boiler.