SteamyTea

How much insulation do you have under the ground floor UFH pipework? Your flow temperatures seem high. So about 10 hours 7.3 kW X 10 h = 73 kWh You don't mean this, you mean kWh.

That is towards the very top temperature for an ASHP. It will kill the CoP.

Coefficient of Performance is just Power Out / Power In. But it needs to be within fixed bounds i.e. output temperature 35°C, external temperature 7°C. SCoP is a method to try an mimic real life conditions, so will have a weighted average for different output temperatures and different external temperatures. So a SCoP in maritime Cornwall will be different from maritime Newfoundland, which will be different from the Swiss Alps, which are different from Idaho's Snake River Plain. I would rather see an isothermal chart. But then I understand them.

Possible SCoP. Dividing max output by Max input does not really work out the CoP.

Not significantly. They all work the same. Don't get temperature and energy mixed up, there is a reason that the words are different.

Why have you not got space for a DHW cylinder?

Is that why the challengers are poaching from the big automotive companies. Still, if the new people can, via software, stop wipers smearing damp dirt over a windscreen, stop headlights dipping when they spot a reflection, brake lights coming on when speed creeps over a set speed (followed a truck yesterday that did this, really annoying) and if Tesla can stop their cars doing emergency stops when the AI picks up on a speed limit sign on the back of a vehicle in front, then I will start to trust software engineering. I think all that is needed is power, temperature and CoP control, with simple overides i.e frost sensing and ToD control.

How many times do I have to push your button. For some reason I am still a Number 2.

They tried to televise it down here, but considered to immoral, but you can get it from your favourite website that starts with an X.

My sister had a dog that was in season once.

Now you have finished, does that mean you are going to 'do a Jeremy' and (expletive deleted) off.

Should be illegal. https://www.bbc.co.uk/programmes/m0011lf7

There is liquid water tight and vapour tight, different thing, should have been a bit clearer about that.

It takes a lot of energy to evaporate water from a brick. So anything that stops it getting into it, the better. If you create a dry atmosphere inside, as long as it is dryer that the partial vapour pressure that the inside brick temperature governs the evaporation rate, forced ventilation will help. Is there not a treatment that can be applied to bricks to stop them absorbing moisture.

Mine isn't on either, it is a very mild November in the SW this year.

Yes, especially as they know they are not going to get any piped in.

I looked into replacing mine a while back. I was not impressed with the cost. I did think of making a plinth, with a couple of fans around the base of mine. Then just control the fan when I wanted more convection. Trouble is my heat load is too small to worry about it.

There are people in the village I work in that still burn coal. Quite a few of them. They were offered bore hole GSHP, for free, a few years back, not many took them up on the offer.

Basically comes down to the thermal properties of materials. You can physically move a lot of energy, quickly, with water, not so easy with air.

How big is this room? Just a case of getting a unit with the airflow needed.

Not really.

Marginal improvements in the insulation, and the brick material, which can make them a little lighter. Some have fans built in as well. But basically, they are just heated bricks and a controllable flap to manage the airflow though them.

If you have a 200m2 house that needs 15W.m-2 heat load, that is 3 kW. So your 1 kW server room should not be too taxing. Now this is not strictly true as some power is going though walls, floors, windows etc, but I don't think it is a problem.

Reminds me of the system my Grandmother had (though she only had once circuit and the thermostat was in the cold hallway). One advantage of using a manifold is that you can control individual circuits, relatively easily. We have moved on since 1950.

That is an advantage of them.