Heat Pumps - post here.

When the moisture level in the air is lower due to appropriate ventilation, the moisture level in the (external) structure is also lower and because the insulation layer(s) make up part of the external structure, the insulation will be dryer and therefore better at insulating (the corollary is also true). This in turn allows us to 'feel' warmer (more comfortable) at lower internal temperatures.

No, there's no automatic opening closing. Just a slider at the bottom of the vent to open and close. We keep it closed, but it might as well be open for all the good it does.

Most heat pumps have a DHW mode that you configure to come on at certain times of the day. During these times the heatpump can output “hotter” water than usual; to get a tank of water up to temp faster and to a higher temp.

they are suggesting that you can go with this plan and set the DHW mode to charge the tank between 2-4 am.

I do exactly this now with my eddi to get the water up to 60C each night:

Which used 5kWh of power last night. With a heatpump doing that you might only consume 2kwh at the worst case.

The jump in temp of the water between 5-6 Pm is done by oil boiler; and only raises the temp to 45C for the baby’s bath.

Yeah I don’t think you’re using it right. With my tank I’m only loosing 1-2C between 4am (when it stops heating the water) and 8am (when I have my shower). And I’m not even sure I’m loosing that energy; I’d say it’s just the water stratification in the tank settling down after the heating stops.

I would assume your heatpump produces a higher flow temp when it’s in DHW mode than what it is configured for your rads / UFH. If it’s constantly topping up the hot water as you use it during the day it will be constantly modulating between a lower flow temp for the heating and a higher flow temp for the DHW. And considering that the electricity between 2-4 am is 1/4 of the price it is during the day it makes sense to me to front load all this DHW into that 2 hour period.

Sorry; don’t mean to say what you’re doing is wrong; just my understanding is that you could set it up in a way what might work out Cheeper in the long run. Your way your always guaranteed to have a full tank of water at your preferred temperature.

Can you set the temperature separately for DHW? If you don’t already have a baseline or how much your HP is consuming then making a change is pointless; as you will never know if it has had a positive or negative impact on the overall amount of energy consumed.

You could quit easily install a CT clamp on your grid and also your heat-pump circuit to give you some useful data. Look up Shelly EM.

It would also be nice to have a probe measuring the temperature of the hot water in your cylinder.

Without this data it would all be guesswork and you could make things worse rather than better.

I don’t have a heat pump :)

The main unit does let you set the DHW temp and what the current temp is.

It's just very frustrating not to be able to access all the useful data on heat pump through an app of some sort. We were told life span of the heat pump was roughly 15 years so I guess we wait another 7 years and look at getting something more modern and connected then

Hello all,

I am looking for recommendations for a heating engineer in the Cork area to help me with setting up my home heating system. I have underfloor heating combined with a Grant Aerona air to water heat pump. There are two air thermostat zones. The house is 3 years old with MHRV, excellent insulation and very good air tightness. Overall I am happy with the system, however I am not convinced I am operating it efficiently or effectively, for example there is a significant time lag from when the system switches in as demanded by the thermostat and when the room actually reaches the required temperature and then the rooms temp overshoots the required temp and gets too hot. I also do not fully understand the system and its controls. I am hoping to find an engineer who I can employ to fully explain the system to me and how best to operate it. Recommendations welcome.

Thank you.

BAJJ

@bajj What part of Cork?

Anyone have daiken altherma heat pump?

Just want to compare a few settings

180 m2 house. A2 rated. 3 inhabitants (1 long-shower-loving teenager!). Ufh downstairs, rads upstairs. 10 kWh HP installed in May. Thermostat set to 21C for space heating, 50C for DHW.

Figures for October - 103 kWh for space heating; 74 for DHW. Avg. daily combined figure for Oct 5.72 kWh. However, it's been much colder in November so average by day so far 12.5 kWh.

As this is my first winter with the HP, I'm really interested in seeing other Boardies data!

Yep. I can see your house is a 1/3 bigger than mine and you have the thermostat set to 22C, so 14 kWh/day is pretty impressive.

Are you running fixed flow temp or weather compensation and is it stats turning on and off pump or running constantly.