Guide to the System Boiler Prices

Who offers the best system boiler prices in 2018? We compare 64 models of system boiler from eight leading boiler manufacturers in the UK, including Worcester, Baxi, Ideal and Valliant to see who offers the best boiler package.

The aim of this guide is to help you find the right system boiler. We have created some easy to use tables to help you pick the best boiler for your property according to price, performance, warranty and/or efficiency.

Using this Guide...

Most boiler manufacturers produce one or two models of system boiler with outputs between 12kW and 40kW. At the smaller model end, the price difference between the budget and the premium models is quite small. However the disparity grows significantly for the larger models.

To reflect the simplicity of this boiler type, we have grouped all boiler models together based on property size and put them in order of price low to high. Simply find your property size and find your boiler.

We have identified ‘best buys’ in each size group. These reflect an all-round great package focusing on warranty length and efficiency relative to price. We have also highlighted best performance boilers, which are not necessarily the cheapest but offer great efficiencies and warranties.

System Boilers

Bedroom Flat
1-2 bed flat   Price Standard warranty Free extended warranty Central heating output Efficiency
Glow Worm Energy System 12 £712.00 2 2 12 89%
Vaillant ecoTEC plus system 12 £772.00 5 7-10 12 89%
Potterton Promax System 12 £794.00 2 2 12 89%
Vaillant ecoFIT pure system 12 £812.00 2 7-10 12 89%
Worcester Bosch Greenstar System i 12 £879.00 7 8 12 94%
Baxi Ecoblue System 12 £901.00 7 7 13 89%
Bedroom House
2 bed room house   Price Standard warranty Free extended warranty Central heating output Efficiency
Glow Worm Energy System 15 £731.00 2 2 15 89%
Ideal Logic System 15 £741.00 2 2 15 89%
Potterton Promax System 15 £808.00 2 2 15 89%
Ideal Logic + System 15 £809.00 7 7 15 89%
Vaillant ecoTEC plus system 15 £858.00 5 7-10 15 89%
Vaillant ecoFIT pure system 15 £875.00 2 7-10 15 89%
Baxi Ecoblue System 15 £923.00 7 7 17 89%
Worcester Bosch Greenstar System i 15 £926.00 7 8 15 94%
Ideal Vogue System 15 £944.00 8 10 15 93%
Bedroom House
3 bedroom house   Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Gold System 18 £566.00 2 2 18 88%
Ferroli Modena HE 18S 18 £575.00 5 5 17 89
Glow Worm Energy System 18 £757.00 2 2 18 89
Ideal Logic System 18 £810.00 2 2 18 89%
Potterton Promax System 18 £825.00 2 2 18 89%
Ideal Logic + System 18 £841.00 7 7 18 89%
Vaillant ecoFIT pure system 18 £931.00 2 7-10 18 89%
Vaillant ecoTEC plus system 18 £954.00 5 7-10 18 89%
Baxi Ecoblue System 18 £962.00 7 7 20 89%
Worcester Bosch Greenstar System i 18i £974.00 7 8 18 94%
Viessmann 100-W System 19 £1,032.00 5 5 19 90
Worcester Bosch Greenstar System i 21 £1,014.00 7 8 21 94%
Ideal Vogue System 18 £1,015.00 8 10 18 93%
Viessmann 200-W System 19 £1,296.00 5 5 19 90
Bedroom House
4 bed house   Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Gold System 21 £589.00 2 2 24 88%
Ferroli Modena HE 25S 25 £588.00 5 5 25 89
Main System Eco Elite 24 £617.00 3 3 26 92
Glow Worm Energy System 25 £809.00 2 2 25 89
Ideal Logic System 24 £844.00 2 2 24 89%
Potterton Promax System 24 £863.00 2 2 25 89%
Ideal Logic + System 24 £872.00 7 7 24 89%
Worcester Bosch Greenstar System i 24i £1,035.00 7 8 24 94%
Worcester Bosch Greenstar System i 27i £1,042.00 7 8 27 92%
Baxi Ecoblue System 24 £1,053.00 7 7 27 89%
Viessmann 100-W System 26 £1,068.00 5 5 26 90
Ideal Vogue System 26 £1,169.00 8 10 26 93%
Vaillant ecoFIT pure system 25 £1,100.00 2 7-10 25 89%
Vaillant ecoTEC plus system 24 £1,137.00 5 7-10 24 89%
Viessmann 200-W System 26 £1,410.00 5 5 26 90
Vaillant ecoTEC exclusive 27 £1,438.00 5 7-10 27 90%
Bedroom House
Potterton Gold System 24 £609.00 2 2 28 88%
Main System Eco Elite 28 £680.00 3 3 29 92
Ferroli Modena HE 32S 32 £669.00 5 5 31 89
Glow Worm Energy System 30 £833.00 2 2 30 89
Ideal Logic System 30 £877.00 2 2 30 89%
Ideal Logic + System 30 £902.00 7 7 30 89%
Baxi Ecoblue System 28 £1,087.00 7 7 31 89%
Viessmann 100-W System 30 £1,100.00 5 5 30 90
Worcester Bosch Greenstar System i 30i £1,112.00 7 8 30 92%
Worcester Bosch Greenstar System Cdi 30 £1,132.00 7 10 30 92%
Vaillant ecoTEC plus system 30 £1,173.00 5 7-10 30 89%
Vaillant ecoFIT pure system 30 £1,207.00 2 7-10 30 89%
Ideal Vogue System 32 £1,256.00 8 10 32 93%
Viessmann 200-W System 30 £1,519.00 5 5 30 90
Bedroom House
Larger properties   Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Promax System 32 £948.00 2 2 34 89%
Baxi Ecoblue System 30 £1,137.00 7 7 35 89%
Worcester Bosch Greenstar System CDI 35 £1,245.00 7 10 34 92%
Vaillant ecoTEC plus system 37 £1,312.00 5 7-10 37 89%
Viessmann 100-W System 35 £1,511.00 5 5 35 90
Viessmann 200-W System 35 £1,571.00 5 5 35 90
What would you like to find out next?
Is a system boiler right for you?

Boiler Types and Selection – not sure whether to move to a system boiler? Read our guide to the pros and cons of sticking with your existing boiler type or changing to a new type.​

Interested in smart heating controls?

Find compatible Smart Heating Controls – more control and better efficiencies. Smart controls are easy to install. We review Nest and Hive verses boiler manufacturer’s own controls.