I have an aquaponics system in a greenhouse. Occasionally, the sump tanks will freeze or get excessively cold for my tilapia and freshwater shrimp. If I put a common aquarium heater in the sumps to keep them above freezing, and then the water recedes to leave them uncovered, they will either shatter (glass type) or melt things (metal type).
This protective heater tub keeps the heater submerged when the sump temporarily runs dry. The retained water keeps the heater from overheating as long as any remote temperature sensor is also submerged in the tub. The heater then keeps the water from freezing and helps to reduce temperature shock when the pump turns back on.
Heater compartment is 14 inches long.
- Print two of these
- Stick the two halves together with doublesided tape
- Bolster and waterproof the joint with hot-melt glue
- Put pea gravel into the perimeter compartments to prevent flotation and movement
- Lay heater down in tub and zip-tie cables to included eyelets to keep heater in place
- Place tub in sump and fill with water. Sump will then keep it full as the tub doesn't float.
Amazon Basics PETG
Any (but denser infill reduces floatation)
Black/Orange (for visibility underwater)
I cut the doublesided tape (Gorilla brand) and placed it so that there would be a space to fill up with hot glue around the outer perimeter. I think this is a good idea for easy waterproofing.
The size and flatness of the bottom of this print will tend to lift the flexible print plate that Prusa printers have. This item is intended for functionality, and the slight deformation on the bottom of the print does not reduce functionality.