We are finally removing our old oil boiler. It is circa 1987 and can't work as a cold start because it leaks when below 120F. We are going to a heat pump dhw tank and pellet stove or furnace for our backup heat. Primary heat is supplied by our 17-VL in the living room. Our home is 1,250 sq ft and the wood stove does a good job until we get below 10F outside, then we would normally have to run the oil to help. Plus overnight the stove would go out and the oil would carry the load. The old boiler only had 42k of baseboard attached, so not a lot of output. We have looked at a bunch of units and I'm not sure what way to go. The goal is that we could use the pellet source for additional heat on cold days and overnight. My concern is that we do not currently have an air path from the (unfinished) basement to the upstairs. The basement is a typical one in Maine, we have a sump pump so there is no standing water, but it does get somewhat moist when it rains etc. I don't know how I feel about sending "basement air" upstairs - maybe not a problem? Our options I've come up with are: We could do a Heatilator CAB50 in the basement and then have a 500CFM fan with 1micron filter blowing into the living room from the basement. We would need a return duct/vent on the other side of the house back into the basement. We could do a Drolet ECO 65 which has it's own ducting, send that up to the living room. There is no way of attaching a filter to this though, and I'm concerned again about the basement air. Potential mold etc. Maybe this isn't an issue as it would be killed in the pellet stove from the heat? Last, we could build a tiny addition to the kitchen for a pellet stove to sit in. The downsides here are high cost as well as there would be no additional heat to the basement which I was banking on helping the DHW heat pump out in the winter so it doesn't use the resistance elements. Our budget is $6,000 installed. I will do the install, but the $6,000 would need to include all bits and pieces to make it work. What do you guys think?