ASHP & triple glazing

[Joeboy]

Ooh "Marrakesh", SWMBO mentioned there a few weeks back. Looking forward to hearing how it goes?

Yep, keep you posted

It was always on the to do list of places to visit but never got round to.

So we’ve decided to work through the list.

Excellent, we are doing similar. Egypt end of Jan 25 and hopefully a visit to GEM to see the history.

[Joeboy]

SWMBO has just pointed out that the weather forecast has a low of minus one and a 77% chance of snow on day 1 of the ASHP install . I did say it's OK they won't just rip the gable end off.

Although, at some point the gas flue has to come out and the slimline cylinder is going in through the roof too. Hopefully it will be pipework upgrades, flushing and rad upgrades on day 1...

[AGT]

Just keep the wood burners going full pelt to keep the fabric heat losses minimised as the doors will be open all day with people going in and out.

[Joeboy]

Just keep the wood burners going full pelt to keep the fabric heat losses minimised as the doors will be open all day with people going in and out.

Cheers, I've asked what biscuits they want in and we'll set a kettle n that up on utility strip in garage. Exciting yet tbh mildly terrifying times as the refurbishment works post 3g is growing arms & legs!

[Joeboy]

I've said before that I'm not the fastest cat off the blocks but I am tenacious and my subconscious talks to me while I sleep

Stinsy handily posted the other day that most ashp will modulate down to 25% of their potential output given the correct circumstances.

In our case that's 7kW or 1.75kW at 25%. Hmmn that's a fair bit of the 3.6kW hybridinverter output, ah well....I thought

2 days passed before my subconscious whispered COP... I then twigged that on a good day with low & slow flow we will be pulling 450W from the batteries to achieve that 1.75kW output.

I then realised that I've inadvertently been running s HP load test for weeks in the guise of Octopus export. We've had the export set at a Base of 35% (1.25kW) discharge from 05.30 to 23.00hrs. Even on very poor days and No1 son using house we've still had soc left over when the batteries start their now nightly charge.

All the gear is getting dropped by courier at our house on Tuesday. The game commences! (Almost).

[Fintray]

Joe, see below (in the righthand column) for the relevant power consumption for your heat pump.

[Joeboy]

Joe, see below (in the righthand column) for the relevant power consumption for your heat pump.

Thanks Iain, I still can't see photos. Any chance of a link to it?

[Fintray]

Pages 46/7

https://professional.vaillant.co.uk/dow ... 806789.pdf

[Joeboy]

Pages 46/7

https://professional.vaillant.co.uk/dow ... 806789.pdf

Thanks Iain, looking now.

Edit, wow!

[Stinsy]

I've said before that I'm not the fastest cat off the blocks but I am tenacious and my subconscious talks to me while I sleep

Stinsy handily posted the other day that most ashp will modulate down to 25% of their potential output given the correct circumstances.

In our case that's 7kW or 1.75kW at 25%. Hmmn that's a fair bit of the 3.6kW hybridinverter output, ah well....I thought

2 days passed before my subconscious whispered COP... I then twigged that on a good day with low & slow flow we will be pulling 450W from the batteries to achieve that 1.75kW output.

I then realised that I've inadvertently been running s HP load test for weeks in the guise of Octopus export. We've had the export set at a Base of 35% (1.25kW) discharge from 05.30 to 23.00hrs. Even on very poor days and No1 son using house we've still had soc left over when the batteries start their now nightly charge.

All the gear is getting dropped by courier at our house on Tuesday. The game commences! (Almost).

Quite!

That "7kW" HP running low-and slow will produce 1.75kW of heat in exchange for 500W of electric (at CoP of 3.5). That is 42kWh of heat in a day. Which is roughly the same amount of heat as 4 of your 1600W SHs and a 800W SH give your house when charged for 6hrs. This should be plenty to keep the house at a baseline in all but the coldest conditions. And The WBS should be able to provide additional support when it is really cold outside.

In these conditions your 3.6kW inverter should be fine. 500W for the HP still leaves you enough power to run your 10A appliances (one at a time) while your lights/telly and other low-power appliances are running without troubling the grid for peak-priced electric.

However if your HP is cranking (eg to heat DHW, or to warm up a cold house, or because the temperature outside is subzero and your WBS isn't burning) then the HP will be pulling 1.75kW, this would mean you'd be dipping into the grid to run your washer, dishwasher, or any other 10A device. If this is likely to be a regular occurrence you'll need a 5kW inverter (or just pay a few pennies for a bit of peak electric every now and then).

I have a "7kW" A2A HP and a 3.6kW inverter and I do just fine. No WBS here either.

My HP is set to come on at 0600 at its lowest power setting with a target temp of 21℃. Up until now it has been set to turn off at 0800 and had reached temp and turned itself off before then. Today is colder (maybe 5 or 6℃ outside) so the HP is set to come on at 0600 and stay on all day set to it's lowest power and 21℃. Here we are at 1050 and it hasn't hit temp and cycled off yet.