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Running a home sauna on backup power, honestly

Electric sauna heaters draw a lot of power for a long time. Here is the honest picture of what a home hydrogen system means for a sauna.

Why a sauna is a big ask

An electric sauna heater pulls several kilowatts and runs for the whole heat-up and session, often an hour or more. That is a large share of 15 kW continuous output. Run it alongside an oven, a heat pump and a dryer during an outage and you could reach the limit, and a large heater on a multi-person sauna may be a big chunk of the system on its own.

What it would keep running

  • Sauna heater, one big load at a time
  • Sauna lighting and controller
  • Shower and hot water afterwards
  • House essentials first

The energy maths

Every kilowatt-hour from the hydrogen store cost more than three to put in, because round-trip efficiency is 30% or less. A long sauna session uses a lot of stored energy that could otherwise run the fridge, freezer and lights for days. In a multi-day outage, using that store on the sauna is usually a poor trade. Day to day, the sauna should run directly off the grid, ideally in an off-peak window. The system is designed to keep the house safe and running. The sauna comes after that.

How it works →
The H2OME loop: an electrolyser splits water into hydrogen, the hydrogen is stored in a tank for weeks, a fuel cell turns it into electricity for your home, and the water returns to the loop.

What it can do

In a short outage with a well-stocked store, a sauna session can be part of the evening, managed so other big loads are off at the same time. The battery and inverter in UPS mode mean a session that starts on the grid will not cut out mid-heat if the power drops. Whether your heater fits comfortably alongside the rest of the house is something the pilot would size, not assume.

Questions

Can it run my sauna heater?

Within 15 kW continuous, many home sauna heaters can run if other big loads are off. Larger heaters or multi-person saunas may push the limit, and that would be sized honestly in the pilot.

Is it sensible to use stored hydrogen for the sauna?

Usually not in a long outage. Round-trip efficiency is 30% or less, and a session uses energy that could keep the fridge and lights going for days. Run the sauna on the grid day to day.

Will a session cut out if the power drops?

It is designed not to. The battery and inverter run in UPS mode, so a session that starts on the grid carries on without a break if the grid fails.

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