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Thanks CPaul. Yep, I think you've confirmed my feeling that insulating and draftproofing the hosue would be the best bet as it would enable the thermal mass of the building to be used. And to get on with replacing radiators with underfloor. Though we're in an exposed stone-walled farmhouse, so I don...

Now, assuming your non peak times are 7 hours then you will need 127000/2.7 (an average cop) 47kWh input or 6.7kW from the grid to your HP to charge the tank let alone service your heating. Single phase wouldn't be able to recharge in the time required. Hi Andy. I wouldn't be trying to load ALL the...

And thanks HML. Yep, it's definitely beginning to feel like just HP producing elatively low temp heat and thermal store doesn't make a lot of sense. Certainly with domestic payments for providing grid flexibility as they are - just simple time-of-day tariffs. A high temp heat input on top of the HP ...

A very quick google shows 5,000 litre thermal stores at £3-4k. That's not installed though. I'm pretty sure we'd be talking £5-6k once installed by a friendly plumber. Which is roughly price of an off-the-shelf 10kWh battery, right?

Thanks Andy, Very useful indeed. I'm circling around and getting closer to a sense of just how big a thermal store tank would need to be and how much hassle. Big and lots I think. But not yet Really big or really lots! Marcus, yes absolutely. Thermal store definitely makes sense if you have irregula...

Wouldn't just going for a big battery also have the advantage of allowing you to use off peak, cheap, low carbon electricity for all of your electricity needs. I. E. You kill two birds with one larger stone, rather than having to find space for additional thermal store? Yes there'd clearly be that ...

I lean strongly towards a battery for various reasons: One is that it allows you to run the hp at the warmest time of the day (generally lunchtime to midafternoon), which in turn reduces the hp energy consumption. If you're running it at optimum efficiency then the power consumption should be well ...

I lean strongly towards a battery for various reasons: One is that it allows you to run the hp at the warmest time of the day (generally lunchtime to midafternoon), which in turn reduces the hp energy consumption. If you're running it at optimum efficiency then the power consumption should be well ...

Thanks Nowty. Makes sense. At least I know where I stand and can make a suggestion to British Gas.

Any idea who’s doing the trials? Ie am I more likely to get things sorted if I switch to octopus already

Round trip efficiency of a battery is quite a lot better than 75% I would think? Ok, yep a bit higher. (I was thinking utility scale batteries, which need air con.) but still 10-20% losses. And ‘high grade’ electricity that’s being lost, not ‘low grade’ heat. In any case, I’m going to carry on assu...