Nice work! I'm in the UK and just about to get a new 4-pipe gas boiler fitted. Can you share how much adding SAT and OpenTherm cost? I've got HomeAssistant up and running.
Edit: Also, is this a new build or did you retrofit your waste water heat recovery system? I'd like one but in my house the bathrooms are on opposite sides of the house upstairs, so would need to fit one in each and the costs don't stack up. If I built a house with the bathrooms backing on to each other it would be a no-brainer.
Edit: Also, is this a new build or did you retrofit your waste water heat recovery system? I'd like one but in my house the bathrooms are on opposite sides of the house upstairs, so would need to fit one in each and the costs don't stack up. If I built a house with the bathrooms backing on to each other it would be a no-brainer.