Our home was built in '58 and has baseboard on both the first and second floors. Roughly 3000sqft it has an Oil Furnace (relatively new...2009) that also happens to have one of the very inefficient coil on demand water heaters inside. The furnace supplies a 4 port manifold for 4 zones/loops (2 first floor, 2 2nd floor)
In principle I want to remove the baseboard on the first floor, installing radiant floor between the joists of the crawl space and replace baseboard on 2nd floor with wall mounted Hydronic radiators (we had these in Europe with great success). Hot water temp in the shower has the classic too hot then too cold issue due to the coil so would like to fix that.
My primary question is should I use the oil furnace for the radiant heat (assume a mixing valve required due to temp) or should we look to install a electric water heater to handle heating of domestic and radiant water? Or retain the oil furnace and use a heatpump electric heater?
Second question is if we retain the furnace can I use the existing 2 zones for the first floor to feed a separate radiant floor manifold with approx 7 or 8 loops assuming I use a mixer to reduce the water temp entering the radiant floor manifold?
Looking for suggestions. I'll install heat transfer plates, PEX and insulation myself but likely need some assistance on the furnace/heater side of things.
Thanks in advance