DIYbanter - View Single Post - Tankless in series with Traditional Water Heater?

Mark Sparge

wrote:
Mark, that is exactly what I want to know. if you are right, then I
should be able to put a small, single room, in-line unit before my hot
water heater, and during peak hot water usage, still have enough hot
water for everyone to take showers. I wonder how much more in
electricity this type of set up will run me?

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I'd probably be tempted to go a bit larger than the minimum, just
because of the increased flow-rate capability. Any amount you can
raise the temperature into the big tank will be a savings -- though
there may be some point of diminishing returns. You will probably
raise your electric bill some with the tankless, but certainly less
than if you put another tank-type in line with the existing heater.

Marrk