@roamingbull I'll stick with it for now. My total electricity bill is about £300 per month. If the ASHP worked like I think it should at low temps then it might save me £500 p.a. - that's £40 a month. Nice to have but it's not a deal breaker. I can blow £500 on a plumber/heating engineer visit and have nothing to show for it.
Glad you liked Whistler - we lived only 90 minutes away so often went up for the day. Next month, already excited, we are off to Jackson Hole. Have always wanted to go there but it's a bit of an expedition from the UK. Something of a pilgrimage.
Obviously we will stick with the ashp but was hoping that after 3 years and two visits of a EHG we would be smiling. Tbh our electric only bill probably equates to £2-2.5k for a 300m2 house so shouldn't grumble. Just when paying for the heating I want heat!!
Hmmm Jackson Hole, you flying to Bozeman/Yellowstone Airport to get there? Bozeman and surrounding area looks right up our street and tbh so does West Canada. Jackson hole gets a serious amount of snow and I'd like to go.
I read an article on Nick Faldo as he lives near Bozeman and enjoys life there.
Out of interest are you staying on the mountain or in the Town?
This post was modified 6 months ago by RoamingBull
@roamingbull This is getting a bit off-piste! We are going BA/American via Dallas. Staying at the Wort Hotel in Jackson. There's a regular shuttle/ski bus to the mountain. Snow is dry and deep in the Tetons. Lovely.
@roamingbull This is getting a bit off-piste! We are going BA/American via Dallas. Staying at the Wort Hotel in Jackson. There's a regular shuttle/ski bus to the mountain. Snow is dry and deep in the Tetons. Lovely.
Mike
Superb enjoy and as you rightly state it's taking the piste.
It's a balmy 19c inside atm. Maybe i should just increase the flow temp.
@mab Sadly, lower temps aren't helping me at all - entered the night at -7C and left at -2C.
I tried dropping target LWT yesterday (the theory being that if I could hit that LWT, HP would modulate down, and "less energy required" = "less energy taken from air" = "fewer defrosts") but that didn't help, as I still didn't hit the target overnight. Running thru the night I just about maintained 18C downstairs, and 16C upstairs, but I'm needing extra heating to feel comfortable.
Defrost every 40 or so mins. It's the recovery from defrost which is the issue I feel. I'm wondering if stopping the secondary pump during a defrost cycle would help, as I'm circulating the cooling LWT which might be cooling the radiators faster than they'd be losing heat to the rooms? It might not be a simple yes/no answer though.
Theory would suggest fewer defrost cycles at OAT's below -3C. Where do you live and do you suffer high humidity levels?
I'm in a village in Cumbria, on the edge of the Lake District. Yesterday was one of those still days, with freezing fog hanging low to the ground; today has been more steel-blue skies and weak sunshine, but smattering of snow this morning, so conditions are pretty damp, but crisp. Whenever it's cold there's always a hard frost.
@roamingbull Until yesterday evening they were what I got from the installer (WC was off, so I'm surprised these differ from the default values):
21 02 = 50; 21 03 = 30; 21 04 = -4 ; yesterday evening I changed them to:
21 02 = 45; 21 03 = 28; 21 04 = 0
My reasoning being that I might hit 45C on LWT but there was no chance of hitting 50C. I have hit 45C a few times today, but none overnight. In sub-zero conditions the gradient of the curve seems fairly irrelevant as you're always aiming at 21 02.
Allyfish and DerekM have given great assistance to myself along with the EHG I got in. Only thing is when it becomes cold then you realise that it needs some patience.
We are set 2102 36c. At this flowrate yes we have plenty of adjustment but I don't understand why we have been 60/70kw per day. Because surely the higher I lift the 2102 the more I burn I guess.
03=30c
04=0c
My friend is in between Windermere and Ambleside and he's just had and EHG from Liverpool visit as he has had issue's. Albeit not with Grant ASHP.
Allyfish and DerekM have given great assistance to myself along with the EHG I got in. Only thing is when it becomes cold then you realise that it needs some patience.
We are set 2102 36c. At this flowrate yes we have plenty of adjustment but I don't understand why we have been 60/70kw per day. Because surely the higher I lift the 2102 the more I burn I guess.
03=30c
04=0c
My friend is in between Windermere and Ambleside and he's just had and EHG from Liverpool visit as he has had issue's. Albeit not with Grant ASHP.
To help with your understanding.
The LWT dictates how much thermal energy it will be possible for the heat emitters to emit. If your radiators or UFH is warmer, it will give out more heat.
The amount of thermal energy being produced by the heat pump is not set by the LWT, but by how much thermal energy is being demanded by the heat emitters. Obviously, for the heat emitters to be able to demand more thermal energy they must be emitting it, which does require a higher LWT.
A heat pump has to work slightly harder to produce a higher LWT, but the main factor that governs how hard the heat pump really does need to work, is how much thermal energy the heat emitters are 'gobbling'.
Maybe I left it too late when it was relatively mild to play catch up for the cold snap? And should have increased prior as we were only pulling 35 kw per day whole house which was last week. Now go ahead and it's chewing through 70.
Last week EHG stated hmmm for the size of the house etc it's running well with the daily usage. Two days later boom.
I'd love to just not have the thought of whether the house will get up to temperature or not.
This post was modified 6 months ago by RoamingBull
Maybe I left it too late when it was relatively mild to play catch up for the cold snap? And should have increased prior as we were only pulling 35 kw per day whole house which was last week. Now go ahead and it's chewing through 70.
Last week EHG stated hmmm for the size of the house etc it's running well with the daily usage. Two days later boom.
I'd love to just not have the thought of whether the house will get up to temperature or not.
The WC curve needs to match the heat loss of your home, so if you find that your home is not achieving the desired temperature with the curve set at say 50C LWT @ -5C OAT, then it may need to be set higher.
The WC curve will not keep the IAT constantly at the desired level, since there are other factors such as solar gain, wind chill, rain effect and human activity, which are not taken into account by the controller. Nevertheless when the WC curve is correctly adjusted, the controller should keep the IAT reasonably constant around the desired IAT.
Correctly adjusting the WC curve is not a 5 minute job, and can take quite a numbers of weeks to complete successfully.
