Heat Pumps - post here.

Has anyone carried out a heat loss calculation recently for a new build?

What air change ratio are you using?

What ratio are companies like Grant using when sizing heat pumps?

Hi folks,

After getting triple glazing done our hli is 1.93. the only thing left we could do is external insulation, semi detached hollow block. We have lots of windows and doors so wondering if it's even worth while. Gas heating for at least 5 years more id say.

Pick the correct plan, and a battery works. Wrong plan, then it's other factors that make the decision: The price of the battery; backup power; FIT rate; getting ready for dynamic pricing (but that's back to the plan -- I hope)

Thanks for reply curiostony. Could you elaborate a bit what you think the correct plan is to make battery work. I downloaded my usage for the last year and I use about 25% elect at night (11pm to 8am), 15% peak (5 tp 7pm) and 60% during day (8am to 11pm ex peak)

the way i thought about a battery was my HP in the winter can consume up to 20kwh in a day, in that context a small battery isnt really worth the hassle, if i could get a 15-20kwh battery and use night rate energy to charge it then yes but your highest HP usage will be in winter, solar production will be lowest and your battery depending on size may only be able to provide 25-50% of your HP usage on colder days.

This depends on if u have UFH or rads

When people say a 12KW heatpump, I assume they are referring to the output power. My Ecotouch 5008.5 has the following specs, and when heating never goes above 1.6kw power input ( close to 8kw output with a COP of 5 ). COP is lower in summer as when it heats the water power usage can go up to 2.2kw.

https://www.waterkotte.eu/heat-pumps/ecotouch-ai1-geo-geo-heat-pump-6-18kw

That's the answer I would have given. There is a thread here to get started

Thanks for the recommendation @paddy236

The inverter compressor will leave it modulate down to a much lower output, it will be rare you would be running at max output. 242sqm and 11kw heat pump i have.

Thanks again championc.

Installer didn't get into that level of detail in terms of consumption. They basically sized the pump by using

Area House (220) * HLI (2) * 24 = 10.6kW .. their closest HP is 12kW.

Their advice re battery was to wait and see what my specific usage is and after a time (12 month) I can choose to add a battery based of this or not

House is 20 years old. Had to replace 2 external doors and 2 windows to get it down below 2. Walls are pumped and generally house is well insulated. Still have to increase insulation in one part of the attic from 150 to 300mm. To get HLI down any further will involve a lot more expense. Oil usage is accurate.

Thanks so much Clkahonda52 for all that feedback and advice.

The TA doesn't mention a specific HP in any of the reports. Like you say there is a list of upgrades to get HLI below 2 but no detail on HP specifics. It did include a published BER. Hopefully this is not an oversight by the TA and doesn't impact the SEAI grant application. I can't see any place in the TA Form where this information should be either. I'll get onto him to ask about this.

I do this work, the HP is in the BER calculations, not explicit in the TA, but you need to be sure that what's in the BER is what you get, or get the BER run with whatever is available.

Mitsubishi ABC will not be the same as the XYZ version, have seen many cases where plumber had one in the van, when other was not available. in one case I had, the unit was available but plumber had been stuck with the unit in the van so shafted the homeowner: we got it sorted as we were able to prove that the correct unit was in stock.

Hey folks, i have a Waterkotte heat pump, about 15 yrs old now. I have hot water for heating but domestic hot water is not working. have checked settings and such and want to try new fuse as logical next step. Opened it up and cannot for the life of me find it. Any help would be great and save what little hair I have left from being pulled out.

Possibly, I will have a look. Gave it a rest let things settle. Thanks

I've seen few designs in UK on YouTube with 35 degrees flow temp.. what flow are you running at?

Its been left on to dry out floors so when its running the fans outside will also be running. In these warm temps the fans wont make much noise at all though, only when it gets much colder it gets noisy at the fans. Usally there is drying out program built into the system that the plumber activates for few days.

Was it hard to get the Valliant heat pump are they sold in Ireland yet? Did you also get the Valliant cyclinder?