Well I'm sure this has been addressed a million times. I have tried searching but not getting a clear answer. What are the pros and cons of running wood boiler parallel so that your existing boil says warm vs turning boiler off and letting it cool down to room temp. When the fire goes out and the storage is cool then the boiler fires up and has to come up to temp. The oil boiler in question is a 12 year old peerless cast iron. I wanted to hook it up so the boiler would automatically be turned off when w/b or storage is up to temp.