5 ms·

The Japanese hot water things basically solve this problem too by maintaining hot water all the time.

• orra 6y ago
  Convenient but inefficient.
  • sjg007 6y ago
    So water heaters are inefficient? I’m confused, they save time.
    • orra 6y ago
      I mean the thermal (and hence, electrical) inefficiency of keeping hot water warm all the time. Similarly, even with good insulation, a combi boiler is more efficient than having a hot water tank.