Octopus heat pump

[Joeboy]

There is a whole load of needless complexity that a heat pump installation is required to have in order to qualify for the grant.

This is visceral for me. I Don't like being told what to do and as for a part of a home system (aye, my home) being decided by someone else.... oh deary deary me.

You can easily plumb in this:
https://www.theheatpumpwarehouse.co.uk/ ... troller=NO

or this:

https://www.ebay.co.uk/itm/276019808137

Yourself!

Woohoo, will look, thanks Stinsy! The aim this Winter is to not touch gas at all. March 23 was our last meaningful use of gas (80kWh for the month) and nothing since April.

Got SWMBO onside about using WBS, storage heaters, HWT immersion & IO this Winter. If I can make that happen without meltdown....I'll have a new starting line to play from and can consider seriously the aesthetic & cop performance of these heat pumps in my wee world.

[Stinsy]

Woohoo, will look, thanks Stinsy! The aim this Winter is to not touch gas at all. March 23 was our last meaningful use of gas (80kWh gor the month) and nothing since April.

Got SWMBO onside about using WBS, storage heaters, HWT immersion & IO this Winter. If I can make that happen without meltdown....I'll have a new starting line to play from and can consider seriously the aesthetic & cop performance of these heat pumps in my wee world.

One of the above would be perfect for you then!

You could set a silly-low flow temp (eg 25℃) for ridiculous COP and a bit of background heat to augment your other heating sources, then have the weather compensation curve auto adjust up the flow temp as the outside temperature gets colder.

With your big battery it really is a no-brainer!

[nowty]

So why is the government and the plumbing and heating industry saying "have a heat pump"? if a heat pump can only do one thing or the other ? Theres something missing in my knowledge here and its bugging me - but surely we are not being asked by HM government to buy two heat pumps one for DHW and another for CH. What is the KW rating for your DIY system Nowty ?

My GSHP is badged at 8kW but when I measured it, its 6kW, again thats something to watch out for as the max rate might be based on not too cold a temp outdoors, radiator temp of 30 degrees and an unachievable flow rate.

The whole thing DIY, including 300 litre tank and retrofitting a few extra radiators was about £2,500. OK, I got the HP for £1k as xDisplay, and the tank for £500 bankrupt stock.

And after, I bought and installed 2 x A2A HP systems (3.5kW heat output each) for under £1,500.

So thats 3 x HP systems with a combined output of 13kW for under £4k all in and I can run all three HPs simultaneously off my battery system. I've even done it in offgrid mode to prove the battery inverter has enough starting poke.

[Krill]

Dan, I signed up on Octopus site to be contacted when they get this far North. I expect that to be a couple of years and hopefully they'll be doing larger units by then?

It's good to see a company actively getting into and on with it.

I've just done the same on the Octopus website; Especially with the new £7.5k government assistance - has to be worth a look.
It says you need 2m x 1m x 1m space for the hot water tank - that sounds enormous!

I think to qualify for the grant the tank has to be a minimum of 300L.

Are you limited to one tank? Ie would it be legitimate to install two tanks with a combined volume of 300L and still get the grant, that way you could jut run one tank most of the time and still have redundnacy?

It's be helpful for those people with larger homes but fewer inhabitants and more efficient...

[Moxi]

Andy

Many thanks for confirming that it can be done, that has reaffirmed my belief that it was practical. I wouldn’t be going for an MSC certified system because there’s too many charlatan’s increasing the work needed in order to increase the cost to the homeowner and HM government haven’t got a clue so won’t be monitoring the average installation cost to police against sharp practice. I would prefer to understand the process and then design ny specific system and if I can DIY then I will but if not at least I can tell my plumber what I want instead of having to accept what they have to sell or worse what they know how to install- there’s already been some examples of that with solar systems and batteries that we’re all familiar with.

Thanks to everyone contributing- this is a very helpful thread.

Moxi

[Fintray]

I've just done the same on the Octopus website; Especially with the new £7.5k government assistance - has to be worth a look.
It says you need 2m x 1m x 1m space for the hot water tank - that sounds enormous!

I think to qualify for the grant the tank has to be a minimum of 300L.

Straight away I'm switched off by that. Can shove their grant up their collective. I'll decide on my water tank, not some donkey far far away..

Maybe that's just me though.

The quotes I've had in, one had a 250L HWC and the other was a 200L HWC, nothing about must be 300L in the grant form I saw, but that may only be relevant to Scotland.

[rogeriko]

Dont forget hot water from a heat pump is not very hot. You would not be mixing any cold with it for a shower and it probably wouldnt melt the fat when your washing the dishes. Thats why they want a big tank.

[richbee]

Just got my fixed price quote from Octopus - £4600.
Including Daikin heat pump, hot water tank etc and any extra radiators - this is based on detached house with ~200m2 - without any detailed house info like an EPC - like whether it is a 200 year old stone built farmhouse for instance?
Next step to pay a £500 refundable deposit for them to come out and survey to see 'if anything is non-standard and requires extra work'

Not really sure what to make of that

[Joeboy]

Just got my fixed price quote from Octopus - £4600.
Including Daikin heat pump, hot water tank etc and any extra radiators - this is based on detached house with ~200m2 - without any detailed house info like an EPC - like whether it is a 200 year old stone built farmhouse for instance?
Next step to pay a £500 refundable deposit for them to come out and survey to see 'if anything is non-standard and requires extra work'

Not really sure what to make of that

Sounds reasonable and there are millions of variables in all those properties. Is that 4.6k after grant? Looking forward to hearing how it goes.

[richbee]

Just got my fixed price quote from Octopus - £4600.
Including Daikin heat pump, hot water tank etc and any extra radiators - this is based on detached house with ~200m2 - without any detailed house info like an EPC - like whether it is a 200 year old stone built farmhouse for instance?
Next step to pay a £500 refundable deposit for them to come out and survey to see 'if anything is non-standard and requires extra work'

Not really sure what to make of that

Sounds reasonable and there are millions of variables in all those properties. Is that 4.6k after grant? Looking forward to hearing how it goes.

Yes, that's after grant, unfortunately, but not surprisingly!
I'm quite tempted, but maybe not quite ready yet - Both financially and from an understanding point of view - I'd like to have a good idea for myself about sizing of pumps / radiators / cylinders to be able to judge what they propose