This cropped up on my Facebook feed... not sure if it was intentional but it looks like they're fishing for prospective model 3 owners... What really irritates me is how they take advantage of general ignorance around water heaters. 99% efficient sounds good to the lay person but that's a COP of <1 which is TERRIBLE from the perspective of a modern water heater. Heat Pump Water Heaters START at ~2 and go up from there. Besides low efficiency... tankless heaters are BRUTLE on the grid. No one is going to schedule their shower around off-peak hours. You can use a heat pump water heater to store energy and schedule it to heat water during off-peak hours. Some tankless heaters can pull up to 18kW when heating water. It doesn't take many simultaneous showers to really start adding up.