Just got done installing a LAING electrical heater/circulating pump.
What a phenomenal product!
They say its small enough to fit inside a 3 1/2″ wall cavity, that would be tight, but a 5 1/2″ wall no problem. This one fit inside the cap wall next to the stairs. Completely silent when running. All I have to do now is figure out a way to finish the outside of that wall and still have access to the system.
This unit is heating a 12′ x 14′ room.
We used a Roth panel installation over the existing slab, total cost not including labor, under $2000!
This would be perfect for an addition where forced air would be tough to run.
More pics if anyone is interested