Location: Calgary, Alberta Canada
1960 construction 2 storey wood frame house with 150,000 BTU Burnham (age 1999) atmospheric boiler
heating and Tekmar Controls operating a perimeter hot water heating system
. The boiler gets combustion air through a 10" insulated flex pipe/vent system. The heating system works great. I considered a new condensing boiler but my plumber suggested that I wait until the boiler fails.
The house is being renovated, however the heating system is not being modified except for the minor relocation of some heating runs.
Building inspector requires a HRV system to be installed. It is very difficult because there are no existing chases or heating ductwork to distribute the Makeup Air.
1. Will a correctly balanced HRV system interfere with the passive fresh air system of the boiler? I would expect that pressurizing the house will cause the boiler fresh air vent to reverse direction of flow (out rather than in).
2. If I choose to upgrade the boiler now, is there a condensing boiler that has an HRV built in?
3. The HRV ductwork through the house will be 'supply only'. There is no air return duct system back to the exhaust side of the HRV unit. I fail to understand how 'contaminated air' from the 2nd storey, will make its way back to the mechanical room in the corner of the basement without some type of return air ductwork?
Forgive these dumb questions...but I am a land developer.