Carapace Heat-Line freeze protection for off-grid water lines
To answer Malcolm’s question (in my other thread about multipoint foundation systems) about how to go about freeze protecting the water and sewer pipes that will be servicing my off grid cabin I think the solution is the “Carapace Heating Water Pipe”.
The cabin will be off the ground by about 3 feet and the potable water supply pipe (as well as the greywater pipe) will be exposed to freezing temperatures from the underside of the cabin to the ground (and possibly below). The pipe uses 3 watts per foot to operate and be used with a thermostat so that the heat tape is not on continuously.
From their website:
To further increase the energy efficiency of your CARAPACE system, it is recommended to add thermal insulation and a thermostat. The additional thermal insulation works to reduce heat loss, and the thermostat allows you to duty cycle your CARAPACE system based on external pipe temperature. Both accessories combined can increase energy efficiency by as much as 80%. In applications where pipes will be exposed to atmospheric (free) air, closed-cell or other approved weatherproof insulation is required.
Heat-Line recommends to use insulation that is best suited to the environment in which it is going to be installed. A common type of insulation employed with CARAPACE heating cables is water proof pipe foam insulation sleeves. You are also able to implement fiberglass insulation provided it is properly weatherproofed based on the environment.
•Direct earth burial and wet location certified
•120V systems – 3 watt/ft (9w/m) at 50°F (10°C) maximum length of 240 ft. (73m)
•120V systems – 5 watt/ft (15w/m) at 50°F (10°C) maximum length of 240 ft. (73m)
•240V systems – 3 watt/ft (9w/m) at 50°F (10°C) maximum length 660 ft. (201m)
•240V systems – 5 watt/ft (15w/m) at 50°F (10°C) maximum length 540 ft. (165m)
I expect that I will also build an insulated chase around the pipe from the underside of the cabin to below the ground surface.
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