Less Massive Mass Heater

Hooray for the learning curve. This iteration of a mass heater weighs in at just over 100lbs, and took a day to create.

simplicity. Mold form is a plaster hardy-backer board that is an aspect of the form, rather than the previous pop-away mold form. An external frame holds the thin board in place and will absorb the liquid pressure against the form. The seams are sealed with drywall paste.
The stovepipe ends are added in with AL tape and drywall paste on the bottom, and a salvaged board with a routed hole holds the top pipe in-situ. AL vent pipe taped together makes an “S” in the stove, using two straight flexi pipe connected to the stove pipe ends, the straight flexis meet at a short flexi forming the bottom curve of the S.
The drywall screws poking into the interior will help anchor the walls and the aircrete. This is my maximum size possible with a 3’x5′ panel; 14″ x 36 “floor, 13″ x 14″ front/back, 16″ x 36” sides.
Two days of curing in 75 degree temps, an inch or two of shrinkage at the top- and so I poured an un-airated concrete & perlite backfilled with cured aircrete “stones” from the demo’d mass. This will make a nice hard top for the form, and I may grind it flat for a reveal of the red aircrete backfill stone and white bits of volcanic perlite.
Rolled up in the old rubber pond liner to retain moisture in the desert wind, and build heat for a better cure. This form I can easily move into the studio for the weekend snowstorm, and has about 1/4 of the footprint and 1/3 the weight of the demo’d mass- so the trip to the ranch will be easy. Now I just have to weld up the little bench it will sit on to align with the J-Stove.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s