losing heat up my flue

[buck0123]

I have a Aqua-therm wood boiler (pressurized) hooked to my oil boiler in the garage. wood boiler constantly circulates hot water thru the oil boiler. Feed from wood boiler goes into return of the oil boiler and feed from oil boiler returns to wood boiler. my issue is to much heat being lost thru flue.

 

[E Yoder]

The oil boiler flue or the wood boiler? Or both?

 

[buck0123]

Oil boiler. if I put my hand thru the damper I can feel heat going up the pipe.

 

[TCaldwell]

Two ways, one would be a damper on the oil boiler flue, I think field controlls makes it, not sure I’d go that route. Or you could pipe the boilers parallel, this means there is common or shared piping between both boilers, causing no flow through the dormant boiler, thus when your on wood there’s no flow through the oil boiler so no stack losses.

 

[buck0123]

In parallel ok. Will this bring the oil boiler up to temp so it does not fire?

 

[TCaldwell]

No, you will have to wire the aqua stat to be a cold start boiler, how do you get your dwh currently, coil in boiler, superstore as a separate zone or elec, propane ?

 

[TCaldwell]

I have a wiring schematic for a for a wood and backup heat source, piped parallel, it assumes the dwh source is not the oil boiler coil. If you pm me with a phone number I’ll send you a pic

 

[maple1]

I don't really see much way around that if you are heating your DHW with your oil boiler in the summer. You would be losing heat even if your wood boiler wasn't running.

Unless I'm not understanding something.

 

[NP ALASKA]

Automtic damper - I have one on my masonry heater. Work great