A heat-only boiler, also know as a 'regular' boiler, works with a hot water tank on a open vented or sealed heating system. Heat only boilers can be very economical to install. Prices range from around £480 for a small, entry-level boiler to £1,600 for a large, premium range model. In this guide, we compare the prices, sizes, efficiencies and warranty lengths of 67 models from nine of the leading boiler manufacturers in the UK, including Worcester Bosch, Baxi, Ideal and Vaillant. The best heat only boiler for you will be based on your property size and your budget. After you have reviewed individual boiler prices, why not try our Boiler Quote Calculator for a bespoke installation cost, including the cost of the boiler.
Heat Only Boiler Guide | We Compare Prices on 67 Boiler Models
Quick Guide Summary
What is a heat only boiler? Who offers the best heat only boiler prices in 2019?
Overview of Heat Only Boilers
What is a Heat Only Boiler?
A heat only boiler provides heating and works with a cylinder to provide hot water. They can work on an open vented system (you will have tanks in loft) or sealed system. Read our Guide to Open Vented and Sealed Systems for more help.
Find your Best Heat Only Boiler
Use the tables below to find your best boiler based on price, efficiency and warranty length. For example, similar priced boilers offer 2 and 5 year warranties; its easy to see which one is better value!
Found your boiler? What's next?
Get an estimate of installation cost with our Boiler Quote Calculator. Are you looking for flexible ways to pay for a new boiler? Read our comprehensive guide: Ways to Pay for Your New Boiler.
How to use this Guide
Guide to using the boiler tables
Find your property size
Find your best boiler according to budget
What is a Heat Only boiler?
A heat only boiler (also known as a Regular boiler or Conventional boiler) provides heat directly to the radiators and works with a vented hot water tank to provide hot water. Heat only boilers can work on 'open vented' or 'sealed systems' (to work out which system you have and the advantages and disadvantages of each read our Guide to Open Vented and Sealed Systems). Replacing a heat only boiler is very cost effective, however long term maintenance costs will be higher as many of the systems components (pumps, valves etc) are external to the boiler.
Guide to using the boiler tables
The tables are arranged so that you can easily find your property size and then find who offers the best boiler package for your budget. The tables show boiler price alongside warranty period and efficiency so you can find the best value boiler. Most boiler manufacturers produce one or two models of regular boiler with outputs between 12kW and 40KW and everything inbetween. Unlike combi and system boilers, there is not such a great disparity between prices at the lower and upper ends. That is not to say that they are all the same, we have still found great value boilers in all categories.
In the example table below, it is easy to see that the Ideal Logic at £828 is great value with a 7 year warranty. For £90 more you could purchase a Worcester Bosch and get 8 years and a 3% increase in efficiency. The choice is yours!
| 4 bed house | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Ideal Logic + Heat | 24 | £828.00 | 7 | 7 | 24 | 89% |
| Vaillant ecoFIT pure regular
|
25 | £874.00 | 2 | 7-10 | 25 | 89% |
| Worcester Bosch Greenstar Ri
|
24 | £909.00 | 7 | 8 | 24 | 92% |
| Viessmans Vitodens 100-W Regular | 26 | £915.00 | 5 | 5 | 26 | 90% |
In all cases we have considered only wall hung regular boilers
Best Buys and Best Performance
We have identified ‘best buys’ in each size group (highlighted yellow). These reflect an all-round great package. We have also highlighted best performance boilers (highlighted green), which are not necessarily the cheapest but offer great efficiencies and warranties.
Find your property size and open up the table to find your best heat only boiler.
| 1-2 bed flat | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Main heat only boiler | 12 | £480.00 | 2 | 2 | 12 | 89% |
| Baxi 200 Heat | 12 | £653.00 | 3 | 3 | 13 | 89% |
| Baxi 400 Heat | 12 | £669.00 | 5 | 5 | 13 | 89% |
| Potterton Promax SL Heat | 12 | £674.00 | 2 | 2 | 12 | 89% |
| Ideal Logic Heat | 12 | £695.00 | 2 | 2 | 12 | 89% |
| Vaillant ecoFIT pure regular
|
12 | £702.00 | 2 | 7-10 | 12 | 89% |
| Glow Worm Energy Regular | 12 | £704.00 | 2 | 2 | 12 | 89% |
| Vaillant ecoTEC plus regular | 12 | £730.00 | 5 | 7-10 | 12 | 89% |
| Ideal Logic + Heat | 12 | £765.00 | 7 | 7 | 12 | 89% |
| Baxi Ecoblue Advance Heat | 13 | £776.00 | 7 | 7 | 13 | 89% |
| Worcester Bosch Greenstar Ri
|
12 | £786.00 | 7 | 8 | 12 | 91% |
| Baxi Ecoblue Heat | 12 | £795.00 | 2 | 2 | 13 | 89% |
| Viessmans Vitodens 100-W Regular | 13 | £816.00 | 5 | 5 | 13 | 90% |
| 2 bed house | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Main heat only boiler | 15 | £505.00 | 2 | 2 | 15 | 89% |
| Baxi 200 Heat | 15 | £677.00 | 3 | 3 | 16 | 89% |
| Baxi 400 Heat | 15 | £691.00 | 5 | 5 | 16 | 89% |
| Glow Worm Energy Regular | 15 | £722.00 | 2 | 2 | 15 | 89% |
| Ideal Logic Heat | 15 | £730.00 | 2 | 2 | 15 | 89% |
| Vaillant ecoFIT pure regular
|
15 | £733.00 | 2 | 7-10 | 15 | 89% |
| Potterton Promax SL Heat | 15 | £751.00 | 2 | 2 | 15 | 89% |
| Ideal Logic + Heat | 15 | £796.00 | 7 | 7 | 15 | 89% |
| Worcester Bosch Greenstar Ri
|
15 | £801.00 | 7 | 8 | 15 | 91% |
| Vaillant ecoTEC plus regular | 15 | £822.00 | 5 | 7-10 | 15 | 89% |
| Viessmans Vitodens 100-W Regular | 16 | £841.00 | 5 | 5 | 16 | 90% |
| Baxi Ecoblue Heat | 15 | £843.00 | 2 | 2 | 16 | 89% |
| Baxi Ecoblue Advance Heat | 16 | £855.00 | 7 | 7 | 16 | 89% |
| 3 bed house | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Main heat only boiler | 18 | £539.00 | 2 | 2 | 18 | 89% |
| Baxi 200 Heat | 18 | £708.00 | 3 | 3 | 19 | 89% |
| Baxi 400 Heat | 18 | £720.00 | 5 | 5 | 19 | 89% |
| Baxi 200 Heat | 24 | £749.00 | 3 | 3 | 21 | 89% |
| Glow Worm Energy Regular | 18 | £755.00 | 2 | 2 | 18 | 89% |
| Ideal Logic Heat | 18 | £763.00 | 2 | 2 | 18 | 89% |
| Potterton Promax SL Heat | 18 | £780.00 | 2 | 2 | 18 | 89% |
| Vaillant ecoFIT pure regular
|
18 | £802.00 | 2 | 7-10 | 18 | 89% |
| Viessmans Vitodens 100-W Regular | 19 | £858.00 | 5 | 5 | 19 | 90% |
| Worcester Bosch Greenstar Ri
|
18 | £859.00 | 7 | 8 | 18 | 91% |
| Baxi Ecoblue Heat | 18 | £860.00 | 2 | 2 | 19 | 89% |
| Vaillant ecoTEC plus regular | 18 | £894.00 | 5 | 7-10 | 18 | 89% |
| Baxi Ecoblue Advance Heat | 19 | £908.00 | 7 | 7 | 19 | 89% |
| Baxi Ecoblue Heat | 21 | £913.00 | 2 | 2 | 21 | 89% |
| 4 bed house | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Main heat only boiler | 24 | £593.00 | 2 | 2 | 24 | 89% |
| Baxi 200 Heat | 30 | £756.00 | 3 | 3 | 25 | 89% |
| Baxi 400 Heat | 24 | £763.00 | 5 | 5 | 25 | 89% |
| Glow Worm Energy Regular | 24 | £788.00 | 2 | 2 | 25 | 89% |
| Ideal Logic Heat | 24 | £796.00 | 2 | 2 | 24 | 89% |
| Potterton Promax SL Heat | 24 | £822.00 | 2 | 2 | 22 | 89% |
| Ideal Logic + Heat | 24 | £828.00 | 7 | 7 | 24 | 89% |
| Vaillant ecoFIT pure regular
|
25 | £874.00 | 2 | 7-10 | 25 | 89% |
| Worcester Bosch Greenstar Ri
|
24 | £909.00 | 7 | 8 | 24 | 92% |
| Viessmans Vitodens 100-W Regular | 26 | £915.00 | 5 | 5 | 26 | 90% |
| Baxi Ecoblue Advance Heat | 25 | £925.00 | 7 | 7 | 25 | 89% |
| Vaillant ecoTEC plus regular | 24 | £959.00 | 5 | 7-10 | 24 | 89% |
| Worcester Bosch Greenstar Ri | 27 | £1,021.00 | 7 | 8 | 27 | 92% |
| Baxi Ecoblue Heat | 24 | £1,103.00 | 2 | 2 | 25 | 89% |
| 5 bed house | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Glow Worm Energy Regular | 30 | £826.00 | 2 | 2 | 30 | 89% |
| Baxi 400 Heat | 30 | £834.00 | 5 | 5 | 30 | 89% |
| Ideal Logic Heat | 30 | £905.00 | 2 | 2 | 30 | 89% |
| Vaillant ecoFIT pure regular
|
30 | £932.00 | 2 | 7-10 | 30 | 89% |
| Baxi Ecoblue Advance Heat | 30 | £981.00 | 7 | 7 | 30 | 89% |
| Ideal Logic + Heat | 30 | £889.00 | 7 | 7 | 30 | 89% |
| Vaillant ecoTEC plus regular | 30 | £1,000.00 | 5 | 7-10 | 30 | 89% |
| Worcester Bosch Greenstar Ri
|
30 | £1,065.00 | 7 | 8 | 30 | 93% |
| Worcester Bosch Greenstar Classic Cdi | 30 | £1,141.00 | 7 | 10 | 30 | 92% |
| Larger properties | Price | Standard warranty | Free extended warranty | Central heating output | Efficiency | |
|---|---|---|---|---|---|---|
| Viessmans Vitodens 100-W Regular
|
35 | £1,325.00 | 5 | 5 | 35 | 90% |
| Vaillant ecoFIT pure regular | 35 | £1,449.00 | 2 | 7-10 | 35 | 89% |
| Vaillant ecoTEC plus regular | 35 | £1,535.00 | 5 | 7-10 | 35 | 89% |
| Worcester Bosch Greenstar Classic Cdi
|
40 | £1,589.00 | 7 | 10 | 41 | 92% |
