Best Combi Boiler – Find the Best for your Budget

Quick guide summary

Which is the best combi boiler for my property size and budget?

Which is the best combi boiler? Well it depends on your criteria. We think a better question is “which is the best combi boiler for my property's size and budget?” We have undertaken an in depth comparison of combi boilers that considers the price, capacity, warranty and efficiency of the best boiler brands in the UK. Use the tables below to find your best combi boiler. How else can we help? We review compatible smart thermostats, the different ways you can pay for a new boiler, using an 'Approved Installer' and many other topics in our Information Hub. Ready to go? Use our online Boiler Quote Calculator or book a survey with a local heating company.

Follow our step by step guide to find your best combi boiler:

1) Find your property size

• 1-2 Bedroom Flat
​• 2 Bedroom House
• 3 Bedroom House
• 4-5 Bedroom House
​• 5+ Bedroom House

2) Find your budget

• £ - Entry level (cheapest)
​• ££ - Economy (one-up from entry level)
• £££ - Mid-range
• ££££ - Premium (the most expensive)

3) What is your priority?

• Cupboard fit
​• Best overall boiler package
• Best price
• Best efficiency
​• Best hot water flow rate

4) Once you've found your best combi boiler... what's next?

How to use this Guide

Find your property size

Open drop down table, priced Low to high

Do you need a cupboard fit?

Pick the best boiler for your home and budget

Follow these instructions to get the most from our best boiler tables:

1. Pick your property size from the drop down tables below. NB if you have multiple bathrooms, you can opt for the next property size up in order to achieve better hot water flow rates. For example if you have a 3 bed house with 3 bathrooms, with showers that often in use at the same time, you could consider one of the boilers in the 4 or 5+ bed category.

2. Do you need a boiler that will fit in a cupboard? If you are installing your new combi boiler in a kitchen cupboard you will need a compact boiler.

3. Is the length of manufacturer cover important to you? If you are moving in a few years perhaps you do not need one of the more expensive boilers with a 10 year warranty; a budget end boiler with 5 a year warranty will do and save you £500.

4. Is boiler efficiency a big factor in your boiler purchase? If so, you can use the tables to find the most efficient boiler in its budget group.

5. Finally, litres per minute for hot water – this is how fast the boiler can heat cold water. The smaller boilers will always be around 10 litres per minute, the bigger boilers over 16 litres per minute. Litres per minute is important if you and your family have multiple bathrooms and shower at the same time in the mornings.

Find your best boiler according to your budget

1-2 bed flat
Price band   Cupboard fit Boiler cost Manufacturer Cover Warranty or Guarantee Efficiency Litres per minute hot water
£ Glow Worm Easicom 24 Y £ 570 4 G 90% 10
££ Baxi 400 424 Y £ 663 5 W 89% 9.8
££ Baxi Duotec 24 N £ 675 7 W 89% 9.8
££ Ideal Logic + C24 N £ 794 7 W 90% 9.9
£££ Vaillant EcoFIT pure 825 Y £ 864 5-10 G 89% 10.4
£££ Worcester Bosch Greenstar Pro 25i N £ 875 7 G 94% 9.8
£££ Baxi Ecoblue Advance 24 Y £ 920 10 W 89% 9.8
£££ Worcester Greenstar Compact 25Si Y £ 1,010 9 G 94% 9.8
£££ Viessman Vitodens 100 26 N £ 1,050 10 W 89% 8.9
££££ Worcester Greenstar Compact 28CDi Y £ 1,045 10 G 94% 10
££££ Ideal Vogue C26 N £ 1,056 10 W 91% 10.6
££££ Vaillant EcoTEC plus 825 Y £ 1,107 5-10 G 89% 10.5
2 bed house
Price band   Cupboard fit Boiler cost Manufacturer Cover Warranty or Guarantee Efficiency Litres per minute hot water
£ Glow Worm Easicom 28 Y £ 605 4 G 90% 11.7
£ Ideal Independent C30 Y £ 651 5 W 89% 12.3
£ Glow Worm Ultimate 2 30 N £ 694 5 G 89% 12.5
££ Baxi Duotec 28 Y £ 795 7 W 89% 11.5
££ Potterton Titanium 28 N £ 798 7 W 91% 11.5
£££ Vailliant EcoFITpure 830 Y £ 896 5-10 G 89% 12.4
£££ Baxi Platinum 28 N £ 955 10 W 89% 11.5
£££ Baxi Ecoblue Advance 28 Y £ 1,060 10 W 89% 11.5
£££ Viessmann Vitodens 100 30 N £ 1,100 10 W 89% 11.2
£££ Worcester Greenstar Compact 30Si N £ 1,115 9 G 94% 11.5
££££ Worcester Greenstar Compact 32CDi Y £ 1,232 10 G 94% 11.5
3 bed house
Price band   Cupboard fit Boiler cost Manufacturer Cover Warranty or Guarantee Efficiency Litres per minute hot water
£ Ideal Independent C35 Y £ 727 5 W 89% 14.5
£ Glow Worm Ultimate 2 35 Y £ 766 5 G 89% 14.4
££ Potterton Titanium 33 N £ 858 7 W 91% 13.5
££ Viessmann/Vitodens 50 35 N £ 906 7 W 89% 14.5
£££ Ideal Logic+ C35 Y £ 985 7 W 90% 14.5
£££ Vailliant EcoFITpure 835 Y £ 1,098 5-10 G 89% 14.4
£££ Viessmann/Vitodens 100 N £ 1,100 10 W 89% 13.5
£££ Baxi Ecoblue Advance 33 Y £ 1,175 10 W 89% 13.5
££££ Ideal Vogue C32 N £ 1,245 10 W 91% 13.1
££££ Vailliant EcoTEC plus 835 N £ 1,300 5-10 G 89% 14.3
££££ Worcester Greenstar Compact 36CDi Y £ 1,358 10 G 94% 12.9
££££ Vaillant EcoTEC Exclusive 835 with Green IQ N £ 1,634 5-10 G 94% 14.5
4 bed house
Price band   Cupboard fit Boiler cost Manufacturer Cover Warranty or Guarantee Efficiency Litres per minute hot water
£ Ferroli / Modena 38kW Y £ 764 5 W 89% 16.0
££ Potterton / Titanium 40 N £ 930 7 W 91% 16.4
££ Baxi Duotec 40 N £ 985 7 W 89% 16.4
££££ Baxi Platinum 40 N £ 1,225 10 W 89% 16.4
££££ Ideal Vogue C40 N £ 1,399 10 W 91% 16.4
££££ Vailliant EcoTEC plus 838 Y £ 1,570 7-10 G 89% 15.9
££££ Worcester Greenstar Classic 42CDi N £ 1,665 10 G 92% 15.0
5+ bed house
Price band   Cupboard fit Boiler cost Manufacturer Cover Warranty or Guarantee Efficiency Litres per minute hot water
£££ Vaillant ecoTEC plus 938 storage combi N £ 1,570 7-10 G 89% 20.0
££££ Vaillant ecoTEC Green iQ 843 N £ 1,979 7-10 G 94% 17.8
££££ Worcester Highflow 440CDi N £ 2,016 10 G 92% 20.0
££££ Worcester Highflow 550CDi N £ 2,447 10 G 92% 25.0

Best combi boiler for a large house

Even a big combi can only do so much. If you have five or more bedrooms and/or three or more bathrooms that are often in use simultaneously then you may wantto consider a larger floor standing boiler, a small ‘commercial’ boiler or a system boiler with large hot water tank (assuming your water pressure is good enough).

What would you like to do next?

Use our calculator to get an estimate of boiler installation cost

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