Heated concrete garden seats question? Answered
Next year I want to use the garden a lot more, so this winder I'm building a gas bottle wood burner like btop & maybe a BBQ like Babe-BQ from abitdifferent (have access to a few bottles of various sizes) and some concrete (maybe papercrete, if i can gather enough old paper for the whole job) bucket style seats, as I have lots of left over cement from a previous project where the inlaws over estimate (by a large amount!)
So i can use it longer through the year, I'd like to have them heated with some pipes going through them being heated off the burner. I'd have a copper coil at the burner end, but ideally to keep costs down, i'd like to use PEX in the seats.
Will this transfer enough (if any) heat outside the pipe? and also will the concrete absorb the heat?
I was thinking of placing the pipe 10/15mm deep and having it coil back and forth from front of the seat by the knees to the back by the shoulders and back again, 2 or 3 times per seat. It will be a modular design, for smaller molds and adjustability, with each seat connected to the last.
I've added a quick drawing i made. Hope it makes sense.
Was also thinking that I could also set up a solar heater as a pre heater to heat them in the to just take the chill off, but thats a different project for another time
Any suggestions or advice greatly appreciated.