Hey Tim! I just wanted to tell you that I lit my boiler for the first time today. I got the water up to temp and then turned 3 of the 5 heat zones on in my house. Mind you, my house is huge….this boiler is having no problems whatsoever keeping up with the demand!! My gas boiler isn’t even thinking about firing! Thanks for making a fantastic product!! My wallet thanks you too!! Take care brother man!!