Air to Water heating question

trindade · 13-12-2022 2:21pm #1

Hi,

I moved a new home 1 year ago and I have the Air to Water heat pump.

The installer/supplier provided a manual were they highly recommend to not change any of the settings, including the temperature.

I always have hot water, but I also have one thermostat in each floor of my house.

The question is: As the water is always hot (55 degrees) - would make any difference in the electricity bills if I change the thermostat temperature? Not sure about it, but I believe it might use the hot water that is already there... Just concerned with the electricity bills as it is so expensive nowadays :D

Thanks

MENACE2010 · 13-12-2022 3:31pm

https://www.boards.ie/discussion/2058275675/air-to-water-heating-question

Hi , you can change the thermostats in the room , I assume you have Underfloor heating .. that works better if you do not touch it... I have stopped setting the thermostat as the floor does not behave a like a radiator..its slow to respond to temperature changes in the short time you are better off to leave it .. i

trindade · 13-12-2022 3:42pm

https://www.boards.ie/discussion/comment/119991962#Comment_119991962

I do not have underfloor heating... The thermostat is to heat the house only. I would like to know if heating the house increases the energy consumption or not. I am unsure if it does, because the water is already hot and the heat pump is always turned on...

Thanks :)

Doolittle51 · 13-12-2022 3:48pm

Yes, if you increase the setpoint on the house thermostat, your energy consumption will also increase, especially on cold days. What temperature is the thermostat set to?

trindade · 13-12-2022 9:14pm

https://www.boards.ie/discussion/comment/119992053#Comment_119992053

The heat pump is always 55, but to be honest I never touched it as the supplier mentioned in the manual to not touch it...

The thermostat is usually 20 degrees. I thought it might not increase the energy consumption if I change this temperature, because it uses the hot water (that is already hot - 55 degrees!) to heat the house... Thanks

10-10-20 · 14-12-2022 9:32am

https://www.boards.ie/discussion/comment/119993647#Comment_119993647

No, that's not how it works. I think I'm right in saying this but you're describing a thermal buffer-tank, which is a huge tank of very hot water which is used to offset heating times due to the availability of an intermittent heating source (such as a stove). That tank which you have at 55C is your domestic hot water tank and it's used for sinks and showers. You can't power the house's heating off that tank without inputting the same energy to replace it using the Air to Water system. You can probably reduce the temperature of the water somewhat, but you need it up around 55C to prevent Legionella.

I'd step away from the controls if I was you. 😉

Tar.Aldarion · 14-12-2022 2:41pm

https://www.boards.ie/discussion/comment/119994744#Comment_119994744

I just bought a new house, had a look at my tank install and it is as the poster described. They are actually using a domestic air to water heating tank to also heat the house radiators and underfloor here, even though they shouldn't be. They've used the second heat source valve (say if somebody had solar to augment the heating) to instead steal heat from the water tank and sent it to the rest of the house, which will be massively inefficient. Can of worms I don't even want to open. Houses, don't get one.

dbas · 14-12-2022 2:51pm

What heat pump and water tank do you have?

I have grant one and water temp is set to 47 degrees always.

I'll ramp it up to 53 on Bath night and back down again.

I don't have a thermal store though, just a hot water tank(buffer)

trindade · 14-12-2022 3:30pm

https://www.boards.ie/discussion/comment/119996115#Comment_119996115

Mine is a Hitachi - it is good. There is a huge tank in the attic.

Air to Water heating question

Comments