I have hydronic heat in my house and use a oil fired Weil-McClain tankless boiler that is about 6 years old (WGO Gold or WGTO Gold I think). It has one output for the hydronic heat and another for the house hot water...so I don't have a hot water heater. The whole thing works fine.
My question is whether this is an efficient setup as far as oil usage goes. The boiler runs year round cause of the house hot water. I know the heat circuits aren't being used, but it does heat both at the same time.
I have been considering getting a Boderus direct vent boiler cause I hate the power vent I have right now and hear Boderus are great boilers. Would my oil usage be less with a combo boiler/oil hot water heater year round? I have also heard about indirect fired water heaters (superstore?). Any experience and suggestions would be welcomed. I figure I could sell my Weil-McClain cause it isn't that old and still get a decent $ for it.