Well, how is it possible that tankless water heaters use lesser energy compared to conventional water heaters? Tankless water heaters are much more efficient than normal heaters because they only heat the water that you actually use. Where as much energy is wasted for conventional water heaters, where the stored water in the tank is heated again and again.

American Heat ADK 16 KW Whole House Tankless Water Heater US $269.00

Noritz SC-201-6M Tankless Water Heater System Control US $264.95

Tankless Water Heater Olympia 18 KW Whole House New US $205.00

American Heat AH-18 Whole House Tankless Water Heater US $391.00

TITAN N-160 SCR-3 Electronic Tankless Water Heater BRAND NEW US $309.99

Rheem RTGL74XP Outdoor 7.4 GPM Tankless Water Heater for Liquid Propane US $699.88

Bosch 1600H LP AquaStar 4.3 GPM Indoor Tankless Liquid Propane Water Heater NIB US $580.00

NIB GE INDOOR TANKLESS GAS WATER HEATER 7.5 MODEL GN75DNSRSA US $649.88

NORITZ 8 GPM INDOOR NATURAL GAS TANKLESS WATER HEATER US $1,999.99

NORITZ 8.3 gpm INDOOR HOME TANKLESS WATER HEATER NATURAL GAS NG NR83-DVC-NG US $1,319.99

NEW NATURAL GAS TANKLESS WATER HEATER 4.23 GPM / 16 L US $297.95

American Heat 16 KW Whole House Tankless Water Heater US $269.00

Noritz N-0751M-DVC (LP) - 9.8 GPM - 199,900 BTU/H Tankless Water Heater Propane US $910.00

Rinnai Tankless Water Heater R75LSIN Interior Natl Gas US $1,125.00

8 Valve kits for Tankless Water Heater LEAD FREE (T) US $590.00

8 Valve kits for Tankless Water Heater (S) US $460.00

8 Valve kits for Tankless Water Heater LEAD FREE (S) US $590.00

8 Valve kits for Tankless Water Heater (T) US $460.00

Rinnai Tankless Water Heater R94LSIN Interior Natl Gas US $1,299.00

Rinnai Tankless Water Heater R75LSIP Interior LP Gas US $1,125.00

Marey® 4.2GPM/16L Natural Gas Whole House ON DEMAND Tankless Hot Water Heater US $296.95

Rinnai Tankless Water Heater R75LSe Exterior Natl Gas US $1,090.00

Rinnai Tankless Water Heater R94LSe Exterior Natl Gas US $1,290.00

Eccotemp 40HI 6.3 GPM LP Intdoor Tankless Water Heater US $429.00

Eccotemp 40H 6.3 GPM LPG Outdoor Tankless Water Heater US $429.00

Eccotemp FVI12-LP 3.4 GPM Gas Tankless Water Heater US $269.00

Eccotemp 40H 6.3 GPM NG Outdoor Tankless Water Heater US $429.00

Rinnai Tankless Water Heater R75LSEP Exterior LP Gas US $1,090.00

Rinnai Tankless Water Heater R94LSEP Exterior LP Gas US $1,290.00

Rinnai Tankless Water Heater R94LSIP Interior LP Gas US $1,299.00

Noritz N-132M-ASME (LP) - 13.2 GPM - 380,000 BTU/H Tankless Water Heater Propane US $2,905.00

NIB Rheem Tankless Water Heater US $580.00

Bosch Tankless Water Heater ES VVT Vertical Vent Kit for AquaStar 2700ES 2400ES US $270.00

Marey Whole House On Demand 4.2 GPM Propane LP Gas 16L Tankless Hot Water Heater US $296.95

New Rheem/Paloma Tankless Water Heater 7.4 GPM Propane Gas Power Vent PTG-74PVP US $799.99

NEW Rheem/Paloma 5.3 GPM Tankless Water Heater Power Vent Propane RTG/PTG-53PVP US $529.95

HHP HH19 Single Shower Tankless Water Heater US $434.12

HHP HH28 Tankless Water Heater Whole House US $704.95

HHP HH12 Single Shower Tankless Water Heater US $412.47

Stiebel Eltron Tankless Water Heater Tempra 12B US $435.00

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Tankless water heaters come in both electric and natural gas or propane. These types have their own advantages and disadvantages. If you decide to install a gas water heater, not only will you have to run a gas line but you will also have to run a vent for it. You will need to inform the plumber who installs the new gas line, how many B.T.U.’s, the new heater will use, so he can size the pipe correctly.

On the plus side, gas water heaters have a better recovery time than electronic water heaters. Compared to gas water heaters, electronics waters heaters have a very high power draw when they are operating. Fuel cost wise, you will want to install gas tankless water heater for the whole house water heating. Still you need a larger gas line than is standard and the initial installation will be at least twice that of a traditional gas water heater. Granted, but the payback can be just a matter of a few years.