Conserve Flue gas heat recovery devices

A Flue Gas Heat Recovery Device is a device that is fitted to your existing boiler that reuses heat that would otherwise be wasted.

A flue gas heat recovery device works by capturing the waste heat from your boiler via the flue gases and then reuses this heat to improve the efficiency of your hot water system.

Flue Gas Heat Recovery Device
25 Maximum lifetime of measure (yrs)

All boilers powered by either gas or oil, produce fumes when they are in operation. These fumes must be removed so they are sent out of your boiler via a flue in your wall or roof. Without a flue gas heat recovery device these hot flue gases which can sometimes exceed temperatures as high 60°,are simply released from your boiler straight out into the atmosphere.

Flue gas heat recovery devices reclaim much of this wasted heat and then let the cooler flue gases vent out. A heat exchanger is fitted around the flue that comes out of your boiler and this then heats up the mains cold water coming in to your boiler. The heated water is then either stored for later use in a tank, or is used to preheat any incoming water to your boiler so it has a lot less work to do, saving you money on your fuel bills.

  • Flue gas heat recovery devices Advantages

  • Air pollution is reduced as less gasses are released into the atmosphere.
  • On an older combi type boiler, you can save up to 37% on your water heating costs.
  • Easy to install – this is a basic job for a fully qualified and certified plumber.
  • Can cut water consumption by up to 6%.
  • Can reduce carbon dioxide emissions by around half a tonne a year.
  • Maintenance free when fitted.
  • Flue gas heat recovery devices Disadvantages

  • The initial cost to install a waste heat recovery system may financially outweigh the benefit gained in heat recovered.
  • Often the waste heat in the flue gases is released at a lower temperature and this can be difficult to efficiently utilize.

Available with

You can get grants for Flue gas heat recovery devices, below are the schemes this is available with.

* According to data sourced from the Energy Saving Trust website.