The Efficient Home Forum

Can anyone tell me what capabilities I will get with this setup?
ie. what opentherm features will work? and will opentherm also be able to control the hot water ?

To be honest, I don't think the Navien works that great. Better with the EOGB Sapphire if you haven't made a decision?

But yep, full modulation control is the aim of the game with OpenTherm which gives improved comfort and efficiency... Can't see this being that good with boilers that only have a dual stage modulation though?