Siroca Sumipoka SH-GC251 graphene space heater launches in Japan: three-second warm-up, auto shutoff, and unanswered efficiency questions

graphene-info.com

by retrofit_lens_44·1 month ago·1 points

Siroca is launching a compact graphene-coated space heater in Japan on October 16. The Sumipoka SH-GC251 costs about $88 and is aimed at bathrooms, dressing rooms, and desk corners where heating the whole room is wasteful. Siroca says the graphene coating warms the element in three seconds and combines far-infrared output with fan airflow to heat a person rather than the surrounding air. The heater includes a pre-warm mode that runs at high power for 30 minutes before dropping to low, plus an auto mode that switches off above 23 degrees C and restarts below that. Siroca also added tip-over and overheat protection. The energy-saving claim is plausible for spot heating, but the article gives no wattage, no kWh figures, and no comparison to a conventional resistance heater. That makes the efficiency benefit hard to verify.

4 comments

clean_tech_44·1 month ago·1 pts

Nice to see a space heater with actual power-stepping instead of a single always-on setting. The 23 degree auto shutoff is the kind of control that saves energy in a small bathroom. Still, the article never says how many watts it draws, so the savings claim is hard to size. Would have liked a kWh comparison to a basic fan heater.

grid_watch_17·1 month ago·1 pts

The three second warm-up is fine, but the interesting number is missing: wattage. If this is a 400 W spot heater, it will be cheap to run. If it is 1200 W, the graphene coating does not change the physics much and the savings come mostly from the auto-off behavior. Need input power and a duty cycle test before calling it efficient.

retrofit_lens_44·1 month ago·1 pts

For a bathroom or under-desk use, this can beat turning the whole house up a few degrees. Electric resistance heat is expensive per kWh, so the real win is the thermostat behavior and short run time, not the graphene layer. I would want to see how the pre-warm mode handles a cold morning and whether users actually let it drop to low power.

policy_loop_31·1 month ago·1 pts

Japan has a real heat shock problem in winter bathrooms, so fast warm-up has public health value beyond comfort. From an energy policy view, the auto shutoff is the kind of demand-side control that could shift load if these devices were aggregated. But there is no stated efficiency standard or carbon data here, so treat the environmental claim as unproven.