Air to water system

One off house 2017

Does a house have to be a passive house for air to water heating system?

delfagio

One off house 2017 wrote:

Does a house have to be a passive house for air to water heating system?

No doesn't have to be a passive house, any well insulated and good level of Airtightness house can use air to water HP.

But mainly an air to water HP is used for UFH as it is best suited to lower temperatures.

One off house 2017

Thanks. It's UFH I am going with upstairs and downstairs. I don't know too much about air to water as it's not my field of expertise but it has come highly recommended from a lot of people.

delfagio

One off house 2017 wrote:

Thanks. It's UFH I am going with upstairs and downstairs. I don't know too much about air to water as it's not my field of expertise but it has come highly recommended from a lot of people.

Yes it's ideal for UFH. You may have to look into the domestic hot water cylinder and how Air to Water works with that. I'm not very familiar myself. Others on here would have better knowledge.

You would be looking in the region of 10k for A2W installed

Calahonda52

One way of dealing with the hot water is use a2w to heat a coil in hw cylinder and use immersion to bring it to 60/65 for legionella. Plumbing need a valve to stop ufh sucking heat from tank . hp works​ best when temp lift is minimised and kit is properly sized for the local heating degree days and energy demand, works worse when lift is maximum and not...etc as above