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Heat Only Boilers

Heat Only Boilers

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A heat only boiler (sometimes called a conventional boiler) is the core of the central heating system in millions of home across the UK.

Designed to meet higher-than-average and simultaneous demand for hot water and heating within larger households, there are two types of heat only boilers – an open vent system and a sealed system.

Open vent heat only boilers

Open vented heat only boilers require two tanks to operate – a feed and expansion tank to be at the highest point of your heating system and a hot water cylinder.

There’s a heat exchanger inside the hot water cylinder which heats up the water present in it. When water heats up, it expands and excess water is sent via the open vent pipe to the feed and expansion tank (sometimes called the cold water tank).

When the water cools down, the feed and expansion tank then distributes the excess water back into the hot water tank. If water levels begin to run low, the float valve and supply pipe draw in the amount of water required from the mains feeding it into the cold water tank.

If you wish to swap your old open vent boiler for a new one and keep your existing hot water tank and feed and expansion tank, that should be absolutely fine. There may be a risk that a newer boiler might not be suitable for very old radiators but your PlumbProud engineer will advice

Sealed heat only boilers

Sealed heating systems don’t require a feed and expansion tank – they use an expansion vessel and this receives the excess water instead.

If there is too much pressure in the hot water tank (sometimes called the hot water storage cylinder), a pressure relief valve lets surplus water out. Sealed systems draw in water from the mains via a filling loop.

Sealed boilers can be connected to system boilers and combi boilers as well as to a heat only boiler. With an open vent system, you must connect to it a heat only boiler. With a sealed boiler, you also don’t require a cold water storage tank which will free up a lot of loft space.

In most cases, replacing your current heat only boiler with a new one (or with a combi boiler or a system boiler) should be absolutely fine. It’s best to get a PlumbProud engineer around however beforehand because switching to a new system may lead to leaking in pipework and older radiator systems and there may be compatibility issues between a new boiler and the rest of your central heating system.

Get a quote on your new heat only boiler with PlumbProud

The reason why so many households still resist the switch to much more popular combi boilers is that heat only boilers supply hot water and heating around larger properties very well and efficiently. They cope exceptionally well with period of high demand for hot water.

We stock and install all leading brands of heat only boilers into customers’ homes. When replacing a heat only boiler with a new one however, extra care must be taken to see that your pipes and radiators can cope with increased water pressure of a proposed replacement. Get a PlumbProud engineer around and they’ll be able to fully advise you.

To get a free quote on a heat only boiler for your home, please call us on 01604 343053 or enter your postcode into one of the response forms on this page and click “SEND”.

Top 10 boilers

1. Vaillant ecoTEC Plus 415

Our score rating: 96.51%

Efficiency rating
94%
Band rating
A
Output in kW
15 kW
Height
600 mm
Width
375 mm
Depth
320 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,900

2. Vaillant ecoTEC Plus 418

Our score rating: 95.45%

Efficiency rating
94%
Band rating
A
Output in kW
18 kW
Height
600 mm
Width
375 mm
Depth
316 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

3. Vaillant ecoFIT Pure 412

Our score rating: 94.82%

Efficiency rating
94%
Band rating
A
Output in kW
12 kW
Height
600 mm
Width
375 mm
Depth
295 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,800

4. Vaillant ecoTEC Plus 424

Our score rating: 94.77%

Efficiency rating
94%
Band rating
A
Output in kW
24 kW
Height
600 mm
Width
375 mm
Depth
320 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,100

5. Vaillant ecoFIT Pure 415

Our score rating: 94.23%

Efficiency rating
94%
Band rating
A
Output in kW
15 kW
Height
600 mm
Width
375 mm
Depth
295 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,800

6. Vaillant ecoTEC Plus 430

Our score rating: 94.23%

Efficiency rating
94%
Band rating
A
Output in kW
30 kW
Height
600 mm
Width
375 mm
Depth
320 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,100

7. Worcester Bosch Greenstar Ri 12Ri

Our score rating: 94.18%

Efficiency rating
92%
Band rating
A
Output in kW
12 kW
Height
600 mm
Width
390 mm
Depth
270 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,900

8. Worcester Bosch Greenstar Ri 15Ri

Our score rating: 93.93%

Efficiency rating
92%
Band rating
A
Output in kW
15 kW
Height
600 mm
Width
390 mm
Depth
270 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,900

9. Worcester Bosch Greenstar Ri 18Ri

Our score rating: 93.26%

Efficiency rating
92%
Band rating
A
Output in kW
18 kW
Height
600 mm
Width
390 mm
Depth
270 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,900

10. Vaillant ecoFIT Pure 418

Our score rating: 93.11%

Efficiency rating
94%
Band rating
A
Output in kW
18 kW
Height
600 mm
Width
375 mm
Depth
295 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £1,900

Heat only boiler FAQ

Get a quote on a brand new heat only boiler from PlumbProud

With a combi boiler, water pressure often drops if two or more people want hot water at the same time. Heat only boilers perform much better supplying hot water to multiple taps within multiple bathrooms simultaneously. That’s why many owners of larger properties would never consider switching away from a heat only boiler to combi boilers or system boilers.

We’d appreciate the opportunity to come around to your home to find out what you want and address any questions or concerns you have. Our engineer will share their knowledge and experience with you.

To find out more about our range of heat only boilers and which one would be right for your home, please call us on 01604 343053 or enter your postcode into one of the response forms on this page and click “SEND”.

Combi boilers

Choose from the UK’s biggest range of combis

Heat only boilers

The ideal boiler perfect for the largest homes

System boilers

Ideal for 3+ bedroom, 2+ bathroom homes

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