How does Micro CHP work?
Combined Heat and Power (CHP) systems are highly efficient, making use of the heat generated by your heating system. This produces electricity for your home that would otherwise require you to burn additional fuel, thus saving energy and money!
Micro CHP systems contain a condensing boiler that heats water for your hot water and heating needs. Most domestic micro CHP systems will have two burners, one small (engine burner) and one large (supplementary burner).
Technical information made simple
There are 3 main micro-CHP technologies, and the main one in use today in a domestic setting is the Stirling engine. The others, Internal Combustion engine and Fuel Cell, are still being developed for use in domestic environments and are not very common today.
Stirling Engine micro-CHP is relatively new to the market and is being installed in homes in the UK. The technology was pioneering in the 19th Centenary by Robert Stirling and relies on the expansion and contraction of heated and cooled gas to drive a piston which in turn drives a generator to produce electricity. The gases are heated by steam produced by the Micro CHP’s condensing boiler as it heats the water. Stirling engines are both efficient and quiet. A standard Stirling engine can meet around half of an average home’s electricity needs. To maximise efficiency, it’s essential you choose the right sized system for your house – too large and you won’t use the system enough to generate much electricity.
Micro CHP systems are designed to be able to replace your existing boiler and are of an equivalent size, but will need to have an electricity connection. It must be fitted by an accredited installer to qualify for the Government’s finance schemes.
Find out more about the Installation of Micro CHP here.
- Are micro CHP boilers easy to install?
- Yes, installation is comparable to that of a high-performance boiler.
- Can my home be disconnected from the National grid if I use a micro CHP unit?
- No, the house will need to remain connected to the main supply - the unit won't be able to meet all of your electricity needs. As the micro CHP boiler is a gas-fired boiler, the gas connection must also remain in place.
- What are the differences between using a micro CHP boiler and using a high-performance boiler?
- Operationally, there is little difference - the only difference is that the micro CHP unit will need to be connected to your electrical wiring and will generate electricity at a very low gas cost, saving you money on your electricity bills.
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