Dean from ICE Energy arrived this morning for the commissioning of the heat pump system. The sequence was:
Check all the plumbing and electrics and then add glycol to both the ground loops.
The mix has to be exactly right to avoid freezing without making the flow sluggish. Dean checks this constantly with his refractometer until he is happy with the level (-1.2)
Then a certain amount of programming of settings and – at last – time to switch on. And the sensors show heat being produced within a couple of minutes
And if you really want to, you can check out the switch-on event here on video (coming soon) – well, it seemed momentous to us after such a lot of time, work, money and general scepticism that it would actually work.
Then as the evening wore on, the house warmed up and we had hot baths, we were both overcome with the strangeness of it all. Not only no more oil being burnt, but no primary fuel at all – just some extra electricity to run the pumps and compressor when they are needed. A very good feeling – which will be even better if we can generate this electricity as well by wind power early next year.
And the second strange thing was the absense of any timers we have to set: the system uses three sensors (will be four when the pool heating side is wired in) and decides itself when to produce heat for either the hot water or the radiators.
So this phase of the greening of Hedgerley is done and we could not be more delighted.