The Efficient Home Forum

I have two combi boilers in my house, one on the ground floor and one on the first floor. Can you run both boilers off the one evohome system.

Thank you
John

Hi John.

Each boiler requires one evohome controller, therefore you will not be able to run both boilers from one controller.

The EVOHOME Shop Team

On the contrary see why not.
A combi needs a loop applied across two terminals. This looping can b don with a relay fired by BDR91 under control of one controller.

Down side would be perhaps limit of 12 zones per controller

Maybe I can explain better...

If one evohome Controller was used, it would fire both Combi boilers at the same time and if there was no heating demand on one of the Combi boilers (i.e. all the HR92's were switched off on that system) where would the heating water go for the whole time the other Combi boiler was on heating demand?

Each boiler that controls a 'separate' heating system requires one evohome Controller, as per the advice that was given above by our team yesterday. If two boilers control the same heating system (two or more boilers on a low loss header for instance) then one evohome Controller could control this.

I hope that helps.

Thanks,

Richard

Hello everyone,
I have two boilers that heat the air, air warms big house through the channels, the house does not have radiators.
I want to operate with both boilers at the same time, is it possible to register two bdr91 on one controller?
Boilers are not in the same room, so I can not use wires.

thanks