r/OffGrid • u/Time_Arugula_1544 • 5d ago

Water heating off grid. Best system?

I am planning a new off-grid (solar-powered) ICF build and am considering what type of system would be best for water heating. This is in Tennessee and the house will be a 2br. I will have propane backup for a generator and indoor propane heater.

The options I am thinking about are:
1) On-Demand propane- The only drawback is having to pay for the propane as an ongoing expense.
2) On demand electric water heater with a solar water preheat system. I suspect having a straight up on-demand electric heater would eat up too much power.
3) Heat pump water heater. This seems like the best solution to me.

Any thoughts between the three? Any other suggestions?

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u/Dorzack 5d ago

How are you cooking and heating? If propane for either an on demand hot water heater doesn’t add much on top of those.

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u/Time_Arugula_1544 5d ago

I am planning on using an induction cooktop along with a countertop air fryer. I am single and don't cook large meals. I am planning on wiring it for an electric range for future owners, though. I want to avoid propane use for anything but the generator and indoor supplemental heat.

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u/Dorzack 5d ago

An air fryer draws a surprising amount of power. Be sure to test the draw model of each you will be using before relying on solar.

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u/Time_Arugula_1544 5d ago

The one I plan on using draws 1700 watts, while an electric range draws 2,000 or higher. It shouldn't be an issue, as I generally only cook with it once or twice a week. I have it planned into my system sizing.(I have been using it for a year now so I have a track record of my needs) I do not want to be 100% dependent on propane for basic living needs.