I got one installed 2 months ago.
Fantastic bit of kit. The house is a constant temperature pumping heat in or out of our 1950s wooden home.
Out if the 4 options available (air, water, shallow/deep earth) we went for the deep geo thermal option.
They come in, drill a hole for a pipe to go down into the bedrock for 120-180m, stick a flexi pipe in with tubes full of ethanol mix, dug a 1m deep tunnel to our basement and put the heat pump in there. Other than the garden still recovering from the machinery it's been amazing.
The bank was happy to give us a mortgage for it as the system increases our house value by 30%.
There are a few grants out there giving a rough price of £17k-23k for most of the UK, price being higher than other locations in the world due to lack of demand. In Scandinavia, even with everything costing more it only costs £11k.
The shallow earth is an option if you have a lot of land as you bury the piping 2-4m down over a large area, or the water option if you are next to a lake or river. Neither as effective.
An air based heat pump looks like an aircon, cheaper still but least efficient and struggles with temperatures below -10⁰C. The rest are good to -25 and the deep mountain heating can cope down to -40⁰C.
jansman wrote: ↑Thu May 20, 2021 5:38 am.As for hydrogen,that is ( forgive the pun) a bit of a pipe dream. By what I read - and any chemists please correct me if I am wrong- hydrogen molecules are smaller than natural gas molecules. Therefore it would follow that hydrogen would easily leak from joints etc. within our current pipe network, and heaven forbid,within the home.
Hydrogen shouldn't be able to escape from anything methane can't, however, hydrogen is more chemical reactive. The piping may be corroded from the inside out depending on the material used, if one company was cheap or the pipeline went in long ago.
Some parts of the UK are already using a hydrogen mix of 10% Hydrogen to 90% methane as the corrosion is negligible, with a possible maximum of 30% mix.
I think it was Newcastle University who were involved in that study. It popped up on the BBC a few years ago.