On 07/26/2018 02:38 PM, Lee Hart via EV wrote:
4. Tankless demand heaters (that only heat the water when it is actually
needed) are more efficient that anything you can do with a tank-type
waterheater, regular or hybrid.
Yes, when comparing gas tankless to gas tanked heaters.
NO for Electrically operated tankless heaters vs hybrid (heat pump)
water heaters with a tank.
Most tankless heaters are gas as the electric ones require a MASSIVE
service (24-27 KW, 100+ amps) to heat water instantaneously (via a
restive element). Even with heat losses due to storage, the efficiency
of an electrically operated heat pump for heating (4x or better than a
restive element) will always beat an electrically operated restive heater.
Jay
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