Tankless water heaters are obviously with out a tank. They heat the water each time you turn on the hot water tap. Thus they have no need of a storage tank, and do not lose heat. When you turn on the hot water, water flows into the unit, and is heated - either by an electric heater, or a gas one.

Tankless Water Heater Olympia 24 KW Whole House New US $225.00

On Demand Alaska Propane Tankless Hot Water Heater LLC US $349.95

Tankless Water Heater Olympia 21 KW Whole House New free shipping US $215.00

Tankless Water Heater Olympia 27 KW Whole House New Free Shipping US $235.00

American Heat AH-18 Whole House Tankless Water Heater US $390.00

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

New Rheem/Paloma 4.2 GPM Tankless Water Heater Propane High Alt. PTG-42PVPH-D US $449.99

New Rheem/Ruud propane tankless water heater RUTG-66XP US $413.99

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

BOSCH AE 125 POWERSTAR WHOLE HOUSE 4GPM ELECTRIC TANKLESS HOT WATER HEATER WHITE US $791.99

BOSCH POWERSTAR AE9.5 POWERSTREAM TANKLESS INSTANTANEOUS ELECTRIC WATER HEATER US $221.99

Noritz NC250-DV-ASME-LP Tankless Water Heater PROPANE US $1,685.95

Rinnai Tankless Water Heater 180,000 BTU / 7.5 GPM up to 3 bathrooms NSF Japan US $767.00

Bosch Tankless On Demand Water Heater US $275.00

Noritz NR83-DVC-LP Tankless Water Heater US $998.75

Noritz NR83-DVC-NG Tankless Water Heater US $998.75

AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM US $249.95

AQUAH 16L (4.23 GPM) ON-DEMAND NG NATURAL GAS TANKLESS WATER HEATER US $299.99

Noritz NR98-DVC-LP Tankless Water Heater US $1,136.25

AQUAH ON-DEMAND NATURAL GAS NG TANKLESS WATER HEATER,12 L, 3.2 GPM US $249.95

Noritz NR111-DV-LP Tankless Water Heater US $1,637.44

Noritz NR111-DV-NG Tankless Water Heater US $1,637.44

Noritz NR111-SV-NG Tankless Water Heater US $1,637.44

Noritz NR66-SV-NG Tankless Water Heater US $761.25

Stiebel Eltron Temptra 12 Tankless Water Heater US $400.00

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

Rheem EcoSense Tankless Natural Gas Water Heater Plus Remote ECO180DVN3 NIB US $999.99

Bosch Pro Tankless 940 ES NG - Tankless Water Heater - Best Price!!! US $899.99

Bosch Pro Tankless C 1210 ESC NG - Tankless Water Heater - Best Price!!! US $1,619.99

Noritz Tankless Natural Gas Water Heater N-075M1 US $400.00

EZ 202 - Tankless Water Heater LP (Liquid Propane). 3.2 GPM + FREE Mfg Warranty US $264.95

NATURAL GAS NG TANKLESS WATER HEATER 16L, 4.23 GPM US $297.95

NORITZ TANKLESS WATER HEATER LONG 4" DIRECT VENT KIT US $209.99

NORITZ TANKLESS WATER HEATER SHORT 4" DIRECT VENT KIT US $289.99

Bosch Pro Tankless C 1210 ES - Tankless Water Heater - Best Price!!! US $1,529.99

AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 12L, 3.2 GPM US $249.95

AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 16 L, 4.23 GPM US $329.99

AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 16 L, 4.23 GPM US $299.99

AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 12L, 3.2 GPM US $249.95

NEW RINNAI RV53eN - NATURAL GAS TANKLESS WATER HEATER US $549.00

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For instance, you can install an electric tankless water heater right under a kitchen cabinet and it is perfect for instant uses like to get a single cup of coffee you need to start the day or so.

Before buying a tankless water heater, you should consider the type of fuel to power the equipment. To select from electric or gas. In case of electric tankless water heaters, you need to check from your electrician that whether your home can handle the voltage and amperage conditions.