Heating system requirements for house to near passive house standard. Would the following be enough:
1. A stove with back boiler and rads for space heating
2. Mechanical Heat Recovery Ventilation unit
3. Solar Tubes and Electric immersion for DHW
What would you suggest?
and figure out your design loads for both heating and cooling. Then add up all the internal sources and factor in the 100% MUA requirements. Almost certainly will want the ERV, may need a boost from a small heat pump or other sources on that air, depending...
I worked on a framing crew. We built a passive solar house that was a twin to one built in Nova Scotia. I never got a chance to see the mechancals of the house, but I can tell you that the construction is nothing like conventional. There's nothing difficult about it, but the engineering done beforehand has to be top-notch. Right from the site work, to positioning of the house and its orientation to the sun. There can't be any guesswork involved.