System boilers are usually found in modern homes with multiple bathrooms. A system boiler works with an unvented hot water tank. Unlike a 'heat only' boiler the main system components are integral to the boiler. This provides for a more comprehensive boiler warranty from the manufacturer. Prices range from around £580 for an entry-level boiler to nearly £1,600 for a large, premium range model. The best system boiler for your circumstances will be based on your property size and your budget. In this guide we compare prices, sizes, efficiencies and warranties on 64 models of system boiler from nine leading manufacturers, including Worcester Bosch, Baxi, Ideal and Vaillant, to find the best system boiler for you. Once you have reviewed individual boiler prices, why not try our bespoke Boiler Quote Calculator for a full installation cost.
System Boiler Guide | We Compare Prices on 64 Boiler Models
What is a system boiler? Who offers the best system boiler prices in 2019?
Overview of System Boilers
System boilers work with a steel unvented hot water tank. They are usually found in larger properties with multiple bathrooms as they can supply good hot water flow rates simultaniously to two or more outlets (e.g. two showers). Unlike heat only boilers, all of the components that would usually be found external to the boiler (pumps, valves etc) are inside a system boiler. This means more of the heating system is covered by the boiler manufacturer's warranty. System boilers require good incoming water pressure and good internal flow rates to operate at their stated capacity. If you currently have a heat only boiler on a gravity system you will need to check your water flow rates to make sure a system boiler will work.
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 performance alongside warranty period and price so you can find the best value boiler. Most boiler manufacturers produce one or two models of system boiler with outputs between 12kW and 40kW. At the smaller end, the price difference between the budget and premium models is quite small. However the disparity grows signficiantly for the larger models.
In the example table below, it is easy to see that the Vaillant ecoTEC plus at £772 is great value with a 7-10 year guarantee, compared the next cheapest and next most expensive, which only offer a 2 year warranty.
|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
|Potterton Promax System||12||£794.00||2||2||12||89%|
In all cases we have considered only wall hung regular boilers