What plumbing/cabling/preparation is needed to prepare for ASHP in the future?

FreeBear

stripling said:

@NedS

1. Try to locate the heat pump as close as possible to the hot water cylinder - the shorter the pipe runs, the better.

Does this matter very much if the pipe run is in a cellar that has cavity wall insulation? The cylinder would be in a connected garage and the pipes would run about 18-20 meters under the ground floor which would be at ceiling height in the (stand up) cellar and through the cellar wall? 

Look at the manufacturer's installation instructions. I had a read of one of the Daikin manuals, and the pipe run was specified at a maximum of 10m.

saveallmymoney

stripling said:

saveallmymoney said:

bobfredbob said:

Thanks for the info on the amps.  I've no idea the actual kw I would need, but you're right, even at 5kw it would require 5000w/240v=21amps, so I imagine a minimum 32amp dedicated wire would be put in.

I'll have to check the fusebox rating since we have a 9.5kw electric shower and I remember we couldn't (easily) have two electric showers fitted to be on at the same time.

So would this mean losing the electric shower if we have a heat pump?  The unvented will give a better shower than electric, and I guess the immersion is good enough as a backup.

Out of curiosity, how do people with concrete floors/mid-terrace do these type of new cable runs?

5KW is the output, not the input. My 7kw Daikin says it should be on a 19+ amp circuit, but the max draw is only about 9 amps.

However if your unit has a backup electric heater, that can increase the required circuit size considerably.

Hi @saveallmymoney what do you think of your 7kw Daiken ? Are you happy with it? 

From a moneysaving perspective, it was £2k on eBay and i self installed so thats tough to beat. I installed towards the end of the heating season so I can't yet say that we're cosy on a freezing cold day.

I'm impressed by the unit itself and the controls, it is the previous model which is why they are quite cheap to buy at the moment.