Has anyone replaced an old ASHP with a new one?
@pressure sounds like a positive outcome and glad you’re happy with it so far. Keep us posted on your progress and whether running costs are better than with your old unit.
Pre-order: The Ultimate Guide to Heat Pumps
Subscribe and follow our Homeowners’ Q&A heat pump podcast
@pressure very interesting read - thanks for posting. A lot of us will have such decisions in coming years. Hopefully mine is still 10 years away.. LG installed 2020.
How did you decide on 9kw? Did you do heat loss calcs as if new install? Of use actual data from existing heat pump? Or??
Mine is currently 16kw which I think is probably about "right size" on paper but with the way we run with cooler bedrooms and some other rooms also cooler I suspect we could drop to something like 10 or 12 kw.
I don't know how much improvement there might be to COP over the years?
Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV
I settled on 9 kw after:
1. Doing heat loss calcs using free online calculators to give me an idea of the likely requirement
2. the installer got a proper, detailed calculation done based on the house plans etc.
In the end the calcs said 8kw would work but the 9 kw model has a back up immersion heater, which recent experience indicated we definitely need!
I think the new system is more efficient but I won’t have the data to demonstrate that properly for a few months. It’s been quiet and trouble free so far.
Built house with 16kw gen-1 Daikin heat pump in 2008. Installed replacement 3rd-gen 9kw Daikin heat pump 2025. 5.6kw solar. Heat recovery and ventilation. UFH. Massive insulation.
- 26 Forums
- 2,118 Topics
- 46.6 K Posts
- 94 Online
- 4,523 Members
Join Us!
Latest Posts
-
Where can I get these new frb lock shield valves?
Watched the latest homeowners qa and they mentioned som...
By AdamK , 8 hours ago
-
-
With their balancing process Im pretty sure all rads co...
By JamesPa , 9 hours ago
-
The sad end of my ECO4 installation.
This afternoon I was advised by a charity that was help...
By Dwynwen , 11 hours ago
-
RE: Replacing Refrigerant on Mitsubishi Heat Pump
@davidalgarve It should just be recovered by both servi...
By dgclimatecontrol , 15 hours ago
-
RE: Who's your electricity provider and what's your tariff?
Aggregators have been recognised for many years, and it...
By Transparent , 15 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
Great news I edited my previous post (probably af...
By JamesPa , 19 hours ago
-
RE: Double or Triple Glazed Windows?
@toodles Glad to hear things are progressing well for y...
By TRBob , 19 hours ago
-
RE: 300 Liter Tank - Do I have to heat it all?
I agree with @morgan. You can turn down the target t...
By JamesPa , 21 hours ago
-
How to waste energy (and time) playing with AI.
A friend of mine who subscribes to an AI service was ex...
By Toodles , 1 day ago
-
RE: Heat Pump Books For Beginners – Bodge Buster & From Zero To Heat Pump Hero
@topher you’re more than welcome to, yes. I’ll send you...
By Mars , 2 days ago
-
RE: Fitting new shower valve ..........
I’ve never taken a chance when fiddling and changing ou...
By Mars , 2 days ago
-
You should contact the council and report the unsatisfa...
By JamesPa , 3 days ago
-
RE: Benefits of an extra horizontal loop for GSHP
I would deffo install an additional slinky run, especia...
By Transparent , 3 days ago
-
RE: Say hello and introduce yourself
@editor fab - thanks Mars, and keep up the great work o...
By normpang , 3 days ago
-
RE: Compressor and Evaporator Stratification
@trebor12345 So I think the 1st zigzag section shows so...
By ASHP-BOBBA , 3 days ago
-
RE: Is this just haze or something more?
@majordennisbloodnok I was giving a talk to primary sch...
By Toodles , 4 days ago
-
RE: Tesla Powerwall – More of a ‘Luxury’ Than an ROI Winner!
We had our Tesla Powerwall 3 (and Gateway) installed ea...
By Old_Scientist , 4 days ago
-
Indeed. With a battery its presumably the battery con...
By JamesPa , 4 days ago