Hardboard Insulation installed between Hydronic Baseboard Heat Housing and the wall it is attached. Good or Bad idea? Hydronic baseboard housings are normally attached directly to the wallboard, I wonder how much heat is lost through the wall.
Baseboard heat systems are most always installed on exterior walls, some portion of heat transferred to the wall-side of the hydronic housing goes outside. How much? I want to know. I attempted to calculate (and/or measure) the energy transfer, but:
- Creating a solvable differential equation is beyond my intelligence (Eddy currents especially).
- I have no building I can afford to test the idea.
Note: I did install two (2) baseboard (hydronic) heat systems in two (2) apartments of a building I own.:
In one apartment (1st floor) I installed the housings against the wall (as usually done).
In the 2nd floor apartment, I installed the housings with a gap between the housings and the wall.
Unfortunately, I cannot afford to test the idea. Please see the attached.









