ASHP & triple glazing

[Joeboy]

Yes that is a sub-optimal number of cycles. You need to understand the cause of the cycling in order to reduce them.

It is possible they are caused by your HP operating at its lowest power setting and hitting the target indoor temp. This will be helped significantly if you lay off the WBS in these more-mild conditions. The same is true of any remaining SHs, electric towel rails, or other heat sources.

You want the WBS to relieve the HP of the need to operate at high flow temps in very cold conditions. In more-mild conditions it'll serve as backup incase of a powecut.

Thanks Stinsy, that makes sense. WBS is off until late afternoon today. We have a mild, cloudy day today with light drizzle. Won't see the sun so it's an excellent test day for what we can do with this set up incl PV in marginal conditions (500W PV incoming). I messed up my charge times today on the slots which has worked well for the test. Test on at 09.50. I'll let it run for a few hours and see what happens to the soc. In the time I typed this the cop went up to 6.5. The test will also include a 30 minute hwt run too. Trying to keep it as real world as possible.







Edit No1- First lesson for me, house loses 0.1deg in 30 minutes when 10degs outdoors and HP is on DHW cycle.



Edit No2 - At 11am PV is outputting 750W which is significantly more than the HP is currently demanding at 450W. HP doesn't respond fast but it is responding.



Edit 3- 1400W incoming from PV and the sun just came out. A 0.2 heatcurve is too much to ask. Temperature is staying at 18.6degs. I'll give it to 1pm, see if we get a tenth up or not.







Edit 4- At 1pm the system has went quiet but temp is not increasing. I'll try 0.25 heatcurve. Battery is slowly charging from PV. It's December right?

[Ronski]

However your battery means you’re applying cheap-rate electric to the CoP of a HP and you’ve invested in a really good HP installation. Therefore if you achieve a CoP of 5 while using off-peak electric, this results in the price you pay for heat being somewhere between 1 and 2p/kWh.

I had to point this out on a YouTube video the other week, very few realise the combined benefits of a heat pump and batteries (presuming a decent system), and perhaps i should add an EV into mix if you want the cheapest rates on Octopus. This is my second biggest reason for getting a heat pump, comfort being the first.

[Fintray]

Sorry to be a pain, but what's the product name for the eltek? Just doing some research amd forward planning of my own for future AHSP, cheers.

Err, Flatpacks

[Fintray]

Nice, makes all the difference to comfort, that wee bit of extra pop where it's needed. Do you do the 5 drg drop across then when balancing? I've still to do that check but tbh they are all pretty even.

Found this yesterday when in loft. Tsk, tsk, tsk. Will rectify today and check the rest in there. TBH it's just split from it's seal as it a lumpy section of pipe where another component is sited. Although it's a reminder that it's good to check.

I tried balancing mine to get a 5C drop across the radiators and just couldn't get it to 5C, about 2-2.5C was the most.

You will find that the adhesive on the insulation can soften a bit and open when it's on a tight bend, just put some tape or a cable tie round it.

[Joeboy]

Nice, makes all the difference to comfort, that wee bit of extra pop where it's needed. Do you do the 5 drg drop across then when balancing? I've still to do that check but tbh they are all pretty even.

Found this yesterday when in loft. Tsk, tsk, tsk. Will rectify today and check the rest in there. TBH it's just split from it's seal as it a lumpy section of pipe where another component is sited. Although it's a reminder that it's good to check.

I tried balancing mine to get a 5C drop across the radiators and just couldn't get it to 5C, about 2-2.5C was the most.

You will find that the adhesive on the insulation can soften a bit and open when it's on a tight bend, just put some tape or a cable tie round it.

Thanks Iain, duct tape in hand! The 2 1600W & 1 2400W SH's have just departed. That cash turns into a flatpack and a 500W panel for the RV. SH's are away up to a big hoose in Huntly. I do like the secondhand exchange of goods, round & round it all goes with nobtax paid. I'll be heading out about half 12 tomorrow. Any idea what time you'll be here? Kettle on or envelope in front shed.

[Fintray]

I'll be round about 10ish.

[Joeboy]

I'll be round about 10ish.

Excellent, see ye then.

New wrinkle on this whole job and likely n/a to most. I submitted the grant claim just now. I won't get it yet as a new EPC is required as part of the proving paperwork.

I don't want to go for a new EPC until the 3G is in. That leaves me £7,500 oot until the 3G is fitted and EPC carried out.

Just one to bear in mind when going for a grant.

Position now, I am waiting to hear back from the glazing fitters on an estimate for fitting. Back at the start they said March 25 and that's OK (ish) as the cutoff for claim to be completed and in is 15/07/25 so I should have a new EPC about April 25.

[NoraBatty]

Was the grant via home energy scotland Joe?
If so you may want to look into the fine print.
iirc the grant is on the condition no other work is carried out... so the 3G may affect the grant. Unless you get the EPC done in between.
I may be wrong, but its best to highlight given if correct you will lose the grant money.

[Joeboy]

Was the grant via home energy scotland Joe?
If so you may want to look into the fine print.
iirc the grant is on the condition no other work is carried out... so the 3G may affect the grant. Unless you get the EPC done in between.
I may be wrong, but its best to highlight given if correct you will lose the grant money.

Cheers for that. Phoned them this morning and all good, 3G in then epc then grant no problem. I'll see what the glazing guys say. If there's humming & heying for timeline I'll get the epc done ASAP.

Edit- valued the wrong thing there. I'll get a new epc, get the grant and go from there with regard to adjusting it later. What was I thinking?

[NoraBatty]

Sounds like the plan id go with.
Its been a while aince i looked on the HES site but i do recall some wrinkles like that hence why i flagged.
Hate to see a tiny mistake like that cost thousands, and such things do tend to be infelxible for minor errors.
Safer to get one completely under the belt and ticked off as complete, then tackle the other in my view. Ive learned that lesson the hard way with absolutely the worst luck of anyone i know!

Its a pain, but if you arent getting a grant for the 3G, the next time you need an EPC is when the house is on the market. So nice to have it on there, but not actually needed.