I was talking with the man who will install the Cenrral Boiler , if I have it done. He said he would hook it up directly to my FHW boiler, hence making the system non-pressurized. He said a circulator would run continuously from the outdoor furnace to the indoor FHW furnace, keeping the indoor furnace at operating temp. I have a DHW coil in the oil furnace so that would be covered as well.

I asked about corrosion issues. He said it wasn’t a problem, because they put in an additive to cover that.

I wondered what it would cost to run a circulator full time as well.

He also discouraged using a forced air vent on the outdoor furnace.

Does anyone have a set up like this? Is this the best way to go about it?

Thanks