Which category of boiler does the Worcester Bosch Greenstar Heatslave II 25/32 fit into?

The Worcester Bosch Greenstar Heatslave II 25/32 is worthy of consideration if you're looking for a combi boiler for your flat or house.

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 the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler from the Greenstar Heatslave II range a suitable choice for my house or flat?

You should make sure that the boiler you install in your property is the right "size". And, by size, we don't mean how big it is, we mean how powerful it is - the "output".

Your boiler has to be powerful enough to heat all the hot water you need for your radiators and taps. Power is measured in kilowatts and the more kilowatts a boiler has available to it, the more water it can heat.

If the output (measured in kilowatts) is too high, you'll have all the power you need and more but your oil bills will be much higher. If it's too low, you'll often find that the water coming out of your taps and fed into your radiators is only lukewarm.

With the Worcester Bosch Greenstar Heatslave II 25/32 combi's output at 32 kW, which types of property would this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler be most appropriate for?

A heating engineer would recommend that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler would be a suitable installation choice for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

Please remember to consider "flow rates" as well when choosing your new boiler. All combi boilers including the Worcester Bosch Greenstar Heatslave II 25/32 draw water from the mains.

Each combi boiler has its own flow rate (measured in litres per minute) - this tells you how much water it can heat and distribute to your home’s taps and radiators straight from the mains. This Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler's flow rate is 22 L/m.

There is no benefit to you in choosing a combi with a high flow rate if your mains pressure is low - save money by buying a boiler whose flow rate is equal to or slightly more than the pressure in your water pipes.

In addition, if you have a lot of radiators and bathrooms in your home or you have a large household that often uses lots of hot water at the same time, like for regular morning and evening showers, a combi boiler may not be suitable.

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 dimensions does a Worcester Bosch Greenstar Heatslave II 25/32 have?

The Worcester Bosch Greenstar Heatslave II 25/32 boiler measures 855 mm [H] x 520 mm [W] x 600 mm [D] in size.

Over the last 20 years, most homeowners in the UK have shifted from floor-standing boilers like the Worcester Bosch Greenstar Heatslave II 25/32 to more compact, wall-hung units to free up space. You can replace your existing floor-standing boiler with a compact but you should be aware that much of the pipework might need replacing in addition to the cost of the boiler and installation.

There will be a significant one-time investment here - the savings on your oil bills will eventually pay for it but this will take a few years.

It is also important to keep in mind that if you plan to replace an existing heat only or system boiler with the Worcester Bosch Greenstar Heatslave II 25/32, your hot water cylinder and/or expansion tank will need to be removed.

Feel free to contact PlumbProud for information and guidance and we'll be happy to provide it.

Is the Worcester Bosch Greenstar Heatslave II 25/32 condensing or non-condensing?

Condensing oil boilers like the Worcester Bosch Greenstar Heatslave II 25/32 are environmentally friendlier and cheaper to run so, if possible, we strongly recommend that you choose this or one of the very latest models.

Condensing boilers are much more efficient and economical to run because they contain a secondary heat exchanger that captures and recycles the warmth still present in the flue exhaust gases and the water vapour condensation for re-use, meaning that they use less oil to run.

Is the Worcester Bosch Greenstar Heatslave II 25/32 combi an environmentally friendly boiler?

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

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 available figures suggest that installing the Worcester Bosch Greenstar Heatslave II 25/32 combi in your property would be an environmentally friendly choice?

All boilers manufactured in the UK from April 2018 must achieve a SEDBUK “A” grade and an energy efficiency rating of 92% or above. Before that, the minimum was 88% - efficiency ratings of 88% and 89% were scored a “B” and 90%+ an "A".

A boiler's energy efficiency rating describes how much energy it uses and wastes during its standard operation.

The energy efficiency of the Worcester Bosch Greenstar Heatslave II 25/32 was rated at 91% with a SEDBUK grading of "A".

The Energy Related Products Directive (ERP) is European legislation that applies to all products which use or consume energy during their lifespan, including during the manufacturing process and when they're in actual use, right through to the point of final disposal.

The aim is to encourage manufacturers to create new products that are kinder to the environment and create fewer harmful gas emissions.

The Worcester Bosch Greenstar Heatslave II 25/32 has an ERP Heat rating of "A" and an ERP Water rating of "B".

If the Worcester Bosch Greenstar Heatslave II 25/32 breaks down, will I be covered by the warranty?

Parts and labour charges incurred during a repair on the Worcester Bosch Worcester Bosch Greenstar Heatslave II 25/32 boiler are covered by a 2 year warranty.