The economics of a tankless water heater is that it uses no energy when it is not supplying hot water. With a circulating pump it would have to be on most of the time or there would be no hot water to circulate. To cut down on water usage you place the tankless water heater near to use point.
 EZ 101 TANKLESS HOT WATER HEATER PROPANE PORTABLE OPEN  US $80.11
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 NEW INSTANT ELECTRIC SHOWER TANKLESS WATER HEATER 35KW US $54.80
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 Eemax EX012240T Electric Tankless Water Heater US $150.00
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 Rinnai tankless water heater R85 Pluss Propane gas US $300.00
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 Tankless in line electric 120V water heater 10837P1 US $69.99
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 POWERSTAR AE34 110V 30A TANKLESS WATER HEATER REDRING US $119.00
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 TAKAGI TK3 NATURAL GAS INDOOR TANKLESS WATER HEATER US $610.50
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 Rheem tankless propane LPG water heater 199k btu w vent US $1,000.00
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 BOSCH PowerStar AE125 Electric Tankless Water Heater US $188.05
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 LPG PROPANE GAS TANKLESS WATER HEATER 16L US $324.95
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 NEW NATURAL GAS TANKLESS WATER HEATER 423 GPM 16 L US $297.95
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 Tempra 24 Plus Stiebel Eltron Tankless Water Heater US $711.00
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 Tempra 29 Plus Stiebel Eltron Tankless Water Heater US $749.00
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 Tempra Plus 36 Stiebel Eltron Tankless Water Heater US $795.00
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