In continuation of the heater evolution I just installed a Propex HS2211. I keeping with my design ethic of being able to have the bed fully usable outside of camping/short term residence I am really stoked on this solution.
My previous build, detailed here, I used a diesel heater kit that I found on amazon to test, see how much we actually use a heater, and if it is worth it to us to invest in a longer term solution. (If anyone is interested in purchasing the components of this kit, please DM me. The cubby is a custom one 1 of 1 for a 3rd gen Tacoma.)
I was able to use what I learned from the diesel kit to find unused space within the envelope of the truck between the fender and the bed to mount a Propex HS 2211 (since it is out of a sealed environment going with the waterproof upgrade made a lot of sense). If you have any questions about the build, I’m happy to answer them.
I am still waiting for my propane bottle mount, and needed a few parts to clean up the regulator mounting. I will post additional photos once that is complete.
Build Process:
Final test fitting and marking holes.
It is tight up there and this 90deg adapter was crucial.
Mounted and starting plumbing. The spacer we used for the lip that the bed has is 18mm baltic birch ply that has been sealed with polyurethane. Then it was adhered to the side of the bed to prevent rattling, and for fine tuning fitment some super custom spacers (washers, and a random nut were used. To help isolate any potential noise, neoprene washers were placed against the bed/wood on both the outside and inside.
To make this project easier the tire and fender liner were removed. I used some pipe insulation to protect the heat out and cold air return ducting from the sharp edges of the fender liner support.
The location of the hot air inlet, I used the existing vent location from my diesel heater.
Continuing back along the bed, the pipe in the foreground is the combustion air inlet that will be above the fender liner to keep most of the water and dirt out. For my cold air return I drilled a hole in the side of the bed storage box. The blue thing is the back of my power panel you will see in the last two photos.
Plumbing completed. The exhaust runs to a through hull fitting in my driver side fender. We spend most of our time on the passenger side of the truck (it’s also where the awning is) and we wanted to be able to spend time outside without having to worry about exhaust being vented onto us. In the background is the propane line, I placed pipe insulation on it to protect it from rubbing.
View of the inside of the bed. You can see the five bolts and fender washers (with a neoprene washer under each one) that are supporting the heater. Also if you look carefully above the right side of the regulator you will see the hole for the propane line (I have a gland coming to seal that). The hot air inlet is just out of frame above the wheel well.
Power panel for 12v and USB, also it acts as the power isolation switch for the heater. Also the thermostat showing where the wires exit to the bed. After wiring I sealed this hole from the back with electronic grade silicone to prevent water intrusion.
View with the thermostat in its final location.
Wheel well post install, the only real visible thing is the silver exhaust pipe running to the drivers side.