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Heat Only Boiler Guide: Prices, Pros & Cons & Leading Brands

Heat only boilers provide heating and hot water with the use of a separate cold water tank and hot water storage cylinder.

There are many boiler brands around today that offer heat only boilers, which are available with different features and in varying power outputs. Heat only boiler prices vary considerably based on brand, model and output, with the typical cost ranging from £390 to over £2,300. You’re also likely to spend between £600 and £1,500 on the installation, making the total cost anything from £990 to £3,800.

If you’re thinking about upgrading to a new heat only boiler, we recommend you compare prices to give yourself the best chance of saving money on the boiler and installation costs. But before you do this, you also need to weigh up the pros and cons of installing a heat only boiler to ensure you choose the right type of boiler for your property and lifestyle.

By reading our guide, you can find out how heat only boilers work, compare heat only boiler prices and discover the advantages and disadvantages of purchasing one for your home.

How Do Heat Only Boilers Work?

Like system boilers, heat only boilers require a separate cylinder for storing hot water because they work on the principle of stored water. They also need a cold water storage tank that gets water from the mains supply, as well as a feed and expansion tank to ensure the right water level is maintained. The cold water tank in your loft feeds the boiler so that it can heat up the water, and a pump sends the hot water to the storage cylinder (usually located in an airing cupboard). It is the job of the cylinder to provide hot water for your taps and radiators.

Otherwise known as conventional, traditional or regular boilers, heat only boilers have been around much longer than combi and system boilers. As heat only boilers require separate tanks and an additional cylinder, they are best suited to homes with traditional heating and hot water systems in place. These boilers are also good for households with large hot water requirements and properties in areas where water pressure is low.

Heat Only Boiler Advantages and Disadvantages

One of the biggest advantages of installing a heat only boiler is that it can meet the heating and hot water needs of large properties, however, it can be more expensive to run. To determine whether you should purchase a heat only boiler, it’s important to familiarise yourself with all of the advantages and drawbacks.

Advantages

Can cope well with high hot water demands:All heat only boilers use a cylinder to store hot water to enable them to provide plenty of hot water to multiple taps, baths and showers simultaneously. This is ideal if you have a large home with more than one bathroom and typically use a lot of hot water from several taps at once.

Perfect for homes with a traditional system: If you already have a traditional heating and hot water system, a replacement heat only boiler is probably the best option for your home as it will require less work to install. A heat only boiler will also be a good replacement if you have an old radiator system – which will struggle to cope with a combi or system boiler because they both deliver high water pressure levels.

Lower energy bills: Heat only boilers are a lot more efficient than they used to be, with the majority achieving A ratings for energy efficiency. By replacing an old heat only boiler with a modern model, you could reduce the amount of energy you waste and save money on your bills.

Compatible with solar thermal systems: When using a heat only boiler with a solar thermal system, you can cut down your carbon emissions even more and reduce your energy costs even further.

Disadvantages

More loft and storage space is required:Since heat only boilers must be installed alongside tanks in the loft and a cylinder in the airing cupboard, they require a lot of storage space. This could be a problem if you live in a flat or small home where there is no extra space available.

Hot water is limited to how much your cylinder can hold: With a heat only boiler, the hot water is stored in a cylinder until you need to use it. You could run out of hot water if you use a lot at once, and you will need to wait for the cylinder to refill and heat up the water before having access to more. Hot water cylinders are available in a huge range of capacities though, so you could avoid running out of hot water if you have the right size installed.

No access to instant hot water: Another drawback to the water needing to be stored is that hot water is not instant. Instead, you will need to decide ahead of time when you are going to use your hot water. Some heat only boilers come with built-in controls (or optional controls) that allow you to programme the hot water timing to fit around your requirements.

More expensive to install: As heat only boilers requiremore pipework anda number of additional components (tanks and a cylinder), installation can take longer and be more expensive.  

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Heat Only Boiler Prices

The amount you will need to spend on a heat only boiler will depend on your chosen model and its size, as well as the manufacturer. Most brands offer different heat only boiler models, which are designed to suit different needs and households.

Below are some comparison tables that enable you to compare heat only models from different boiler brands to give you a better idea of prices. The prices listed include VAT but exclude the cost of installation.

Worcester Bosch

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Greenstar 24 Ri RegularH - 600 mm
W - 390 mm
D - 270 mm
24 kwN/A £ 915.93
Greenstar 30 CDi Classic RegularH - 760 mm
W - 440 mm
D
- 360 mm
30 kwN/A £ 1,134.00
Greenstar FS 30 CDi RegularH - 855 mm
W - 440 mm
D - 600 mm
30 kwN/A £ 1,155.80
Greenstar Danesmoor 25 RegularH - 855 mm
W - 370 mm
D - 600 mm
25 kwN/A £1,570.80
Greenstar Danesmoor Utility 32 RegularH - 855 mm
W - 370 mm
D - 600 mm
32 kwN/A £ 1,866.93
Greenstar Danesmoor External 32 Regular H - 950 mm
W - 565 mm
D - 780 mm
32 kwN/A £ 2,220.00
Greenstar Utility 70 RegularH - 1012 mm
W - 520 mm
D - 815 mm
70 kwN/A £ 2,268.00

Ideal

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Logic Heat 24 H - 700 mm
W - 395 mm
D - 278 mm
24 kwN/A £ 790.50
Logic + Heat 30 H - 700 mm
W - 395 mm
D - 278 mm
30 kwN/A £ 995.99
Logic Max Heat 24H - 700 mm
W - 395 mm
D - 278 mm
24 kwN/A £ 1,050.82
Mexico HE 30 HeatH - 850 mm
W - 450 mm
D - 530 mm
30 kwN/A £ 1,959.83

Vokera

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Easi-Flo Plus Water HeaterH - 640 mm
W - 400 mm
D - 246 mm
28 kw11.8 l/min £ 390.00
Mynute VHE 20H - 740 mm
W - 400 mm
D - 338 mm
20 kwN/A £ 492.00

Keston

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Keston Heat 45H - 850 mm
W - 500 mm
D - 360 mm
45 kwN/A£2,340.87

Viessmann

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Vitodens 100-W Open Vent 26H - 600 mm
W - 375 mm
D - 285 mm
26 kwN/A £ 961.58

Vaillant

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
ecoFIT Plus Regular 25H - 6000 mm
W - 375 mm
D - 295 mm
25 kwN/A£ 858.00
ecoTEC Plus Regular 30 H - 6000 mm
W - 375 mm
D - 320 mm
30 kwN/A £ 1,014.39

Baxi

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
400 Heat 30H - 625 mm
W - 370 mm
D - 270 mm
30 kwN/A£ 834.00
200 Heat 24H - 625 mm
W - 370 mm
D - 270 mm
24 kwN/A£ 849.41
EcoBlue Heat 24H - 625 mm
W - 370 mm
D - 270 mm
24 kwN/A£ 911.58
EcoBlue Advance Heat 30H - 625 mm
W - 370 mm
D - 270 mm
30 kwN/A£ 981.09

Potterton

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Assure Heat 25H - 700 mm
W - 390 mm
D - 270 mm
25 kwN/A£ 796.79
Promax SL Heat 18H - 600 mm
W - 390 mm
D - 280 mm
18 kwN/A£ 803.58
Titanium Heat 30H - 625 mm
W - 370 mm
D - 270 mm
30 kwN/A£ 842.40
Ultra Heat 24H - 626 mm
W - 370 mm
D - 270 mm
24 kwN/A£ 1,000.00
Promax Store 90H - 1544 mm
W - 550 mm
D - 600 mm
90 kwN/A£ 1,894.92

Glow-Worm

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Ultimate3 RegularH - 600 mm
W - 375 mm
D - 280 mm
25 kwN/A£ 870.00
Easicom3 RegularH - 600 mm
W - 375 mm
D - 280 mm
25 kwN/A £ 887.92
Energy Regular 30H - 600 mm
W - 375 mm
D - 280 mm
30 kwN/A£ 900.28

Ariston

MODELDIMENSIONSOUTPUTMAX FLOW RATEFFICIENCY TYPICAL PRICE
Clas HE RegularH - 595 mm
W - 400 mm
D - 295 mm
24 kwN/A£ 640.95

Don’t forget: Prior to making any decisions, you must ask a Gas Safe engineer to help you determine which heat only boiler model and size is right for your home.

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