I have a new woodstove and new boiler. I get my hot water off my boiler. Each has its own SS liner, stove liner is insulated, but they share a masonry chimney. I've got good draft on both, and the boiler liner has a barometric damper. When I run the stove (most of the time), the draft gets a lot stronger on the boiler flue since its is getting warmed up by the adjacent stove liner. I have been heating the house almost exclusively with the stove, but the boiler still cycles quite a bit to keep itself at temp for domestic hot water. I'm not sure, but it seems like it is more than normal-- increased draft caused by warm flue must be pulling cool air through it and cooling the boiler more rapidly. Do others out there have a similar set-up? how does it work for you? Also, do people out there have thoughts on how to get hot water more efficently? I was thinkng about putting on an indirect tank-- I've had mixed accounts about whether that set-up is more efficient. (sorry, not exactly a wood-heat question). Would that help with the cycling issue? I would think the boiler would only kick on when the tank dropped in temp, and they are supposed to hold temp pretty well.