Oct 29, 2016

Posted by in Boilers | Comments Off on System Boilers Pros and Cons

System Boilers Pros and Cons

I installed many a boiler in my time refurbishing homes and properties throughout the UK. Not exactly my area of expertise in terms of advice and selection but I worked with an industry leader to offer the best service to my clients. AR Johnson is a gas safe registered plumber in Chorley installing upwards of 1000 boilers annually throughout the North of England. Anthony is one of the most trusted engineers around and the quality of their work is unrivalled but he also happily fields questions from consumers all over the UK who just need a little help and advice when considering a new boiler installation. Every single installation job I took on myself was with the help of Anthony and his team and the article below has been provided by Anthony himself explaining the pros and cons of a system boiler for your home.

So how exactly does a system boiler perform?

A system boiler, (often called a ‘sealed system’) works on the process of stored hot water. However is different slightly as many of the systems associated with a conventional system are self contained within the one housing.

This means that hot water is pumped from the system boiler through the home heating system to the radiators and hot water cylinder, this results in a fast response time and more economical operating costs.

A system boiler is preferred for large homes with multiple bathrooms or en-suites.

Benefits of using a system boiler

System boilers have a variety of benefits these include:

  • Near instant, unrestricted domestic hot water
  • These types of boiler have no tank(s) within your loft area – which is good if you either have no loft area or confined loft space
  • More than one hot tap / shower can readily function at same time


As with all boilers there are some downsides. examples include:


  • Hot water is not instant but is still fairly fast
  • When the water in the storage cylinder runs out you must wait for it to reheat.
  • You’ll have to find space for the cylinder (normally an airing cupboard)

system boiler diagramThe Baxi Megaflo System HE, Baxi EcoBlue System, Baxi Megaflo System Compact GA and Baxi Avanta System Plus are extremely efficient, with a SEDBUK 2005 >90% efficiency. This means lower fuel bills and a decline in your carbon footprint when updating an old, standard efficiency type.

If you’d like to future-proof your home heating system, use free direct sunlight and lower the total amount it costs to heat your water, system boilers are compatible with solar thermal domestic hot water systems, like Baxi Solarflo and the Megaflo eco solar cylinder.



If you are considering a system boiler installation in your property you’ll find the video below from British gas useful: