Tankless water heater sizing guides. Shop on Amazon. Compare indoor natural gas units
TANKLESS HEATERS

Explore

Gas tankless water heaters

Filter products
Brand or model
Product category
Clear all
104 products on this page
Browse the full catalog

Filters apply only to the products on this page. Use these links to browse every product in a category.

Read reviews on Amazon

Rheem RTGH Series 9.5 GPM Liquid Propane Tankless Water Heater Indoor | 199,900 BTUs Super High Efficiency On Demand, Continuous Hot Water | Condensing Ultra-Low Nox

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTGH Series 8.4 GPM Natural Gas Tankless Water Heater Indoor | 157,000 BTUs Super High Efficiency On Demand, Continuous Hot Water | Condensing Ultra-Low Nox

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTGH Series 9.0 GPM Natural Gas Tankless Water Heater Indoor | 180,000 BTUs Super High Efficiency On Demand, Continuous Hot Water | Condensing Ultra-Low Nox

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Vancepic Condensing Natural Gas Tankless Water Heater Indoor, 120,000 BTU | 5.1 GPM On Demand Instant Hot Water Heater, with Anti-Freeze and Smart Touch Control, for 2-3 Bathrooms

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem Prestige Condensing Tankless Gas Indoor Natural Gas Water Heater With Built-in Recirculation 11.0 GPM - RTGH-RH11DVLN

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 7.0 GPM Natural Gas Tankless Water Heater Indoor | 160,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater Outdoor | 160,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 8.4 GPM Natural Gas Tankless Water Heater Outdoor | 180,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 7.0 GPM Natural Gas Tankless Water Heater Outdoor | 160,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 9.5 GPM Natural Gas Tankless Water Heater Indoor | 199,900 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater Indoor | 160,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 8.4 GPM Liquid Propane Tankless Water Heater Oudoor | 180,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rheem RTG Series 8.4 GPM Liquid Propane Tankless Water Heater Indoor | 180,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Natural Gas Tankless Water Heater, 4.74 GPM 18L Indoor,Constant propane water heater,Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display,Multi-Protection

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

GASLAND Gasmart E 199,000 BTU Tankless Water Heater, Up to 7.6 GPM, CSA Certified Whole House Natural Gas Indoor Installation Residential On-demand Instant Hot Water Heater, CE686NG

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Vancepic Natural Gas Tankless Water Heater, 4.8 GPM 110,000 BTU, Indoor | 3-5 Point Use for Family, on Demand Instant Hot Water Heater with LED Display, Child Lock Design

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

SNDOAS Tankless Water Heater Natural Gas, Up to 4.23 GPM 853,00 BTU, ±1°F Precise Temperature, Anti-Freeze Protection, Oxygen-Free Copper Heat Exchanger, Ultra Quiet, Indoor Whole House

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

SNDOAS Tankless Water Heater Natural Gas, Up to 4.23 GPM 853,00 BTU, ±1°F Precise Temperature, Anti-Freeze Protection, Oxygen-Free Copper Heat Exchanger, Ultra Quiet, Indoor Whole House

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Vancepic Natural Gas Tankless Water Heater Indoor,4.3 GPM | 3-4 Point Use for Family, 100,000 BTU, on Demand Instant Hot Water Heater with LED Display, Silent operation, Child Lock Design

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

VEVOR Tankless Water Heater Propane, 5.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Outdoor Use for Whole House

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

CAMPLUX 5L Portable Tankless Water Heater, 1.32 GPM Outdoor Propane Shower for Camping, RV, Off-Grid, Instant Hot Water with Folding Handle, Overheat Protection, Low Pressure Startup, AY132, White

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Outdoor Propane Tankless Water Heater, 110000 BTU 4.76 GPM Instant Hot Water Heater with Remote Control, 110V-60Hz AC, Low Pressure Startup for Home & RV

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Propane Tankless Water Heater Outdoor,5.26GPM 20L Outdoor,Instant Hot Propane Gas Water Heater with Celsius Digital Display,Multi-Protection

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Outdoor Propane Tankless Water Heater - 6L 1.58 GPM Portable Gas Water Heater with Handle & Overheating Protection, Instant Hot Water for RV Cabin Camping Boat Barn

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Noritz NR50ODLP Outdoor Tankless Water Heater, max. 120,000 Btuh, 5.0 Gpm - Liquid Propane

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM - Natural Gas

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Noritz NR66ODLP Outdoor Tankless Water Heater, max. 140,000 Btuh, 6.6 Gpm - Liquid Propane

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Noritz NR98SVLP Indoor Only Tankless Hot Water Heater, Single Wall Vent, max. 199,900 Btuh, 9.8 Gpm - Liquid Propane

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Takagi T-H3S-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 8-Gallon Per Minute

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Takagi T-H3S-OS-N Condensing High Efficiency Natural Gas Outdoor Tankless Water Heater, 8-Gallon Per Minute

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Takagi T-H3S-OS-P Condensing High Efficiency Propane Outdoor Tankless Water Heater, 8-Gallon Per Minute

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

A. O. Smith Tankless Water Heater Natural Gas - On Demand Hot Water - 10 GPM - Outdoor 199,000 BTU Condensing - ProLine® XE ATO-540H-N

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

CAMPLUX Portable Tankless Water Heater 1.58 GPM, BW158B Outdoor Propane Water Heater Camping, 41,000 BTU, Black

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Propane Tankless Water Heater, 5L 1.32 GPM Outdoor Portable Gas Instant Hot Water Heater with Digital Display Overheating Protection, for Camping Barn Cabin RV White

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

CAMPLUX 1.58 GPM Portable Tankless Water Heater with Water Pump Kit, Propane Water Heater Outdoor with 1.2 GPM Pump, 41,000 BTU, BD158P43

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Marey Tankless Water Heater Gas, 7.5 GPM, 170,000 BTU, Liquid Propane, CSA Certified, Indoor

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Outdoor Natural Gas Tankless Water Heater, 110000 BTU 4.76 GPM Instant Hot Water Heater with Remote Control, 110V 60Hz AC, Low Pressure Startup for Home & RV

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Natural Gas Tankless Water Heater, Outdoor Installation, Up to 5.3 GPM 130000 BTU On Demand Residential Natural Gas Instant Hot Water Heater Outdoor with Remote Controller, 110V, CSA Certificated,Gray

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Natural Gas Tankless Water Heater, Outdoor Installation, Up to 5.3 GPM 130000 BTU On Demand Residential Natural Gas Instant Hot Water Heater Outdoor with Remote Controller, 110V,CSA Certificated,White

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

Natural Gas Tankless Water Heater,5.26GPM 20L Outdoor,Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display,Multi-Protection

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details
Read reviews on Amazon

VEVOR Tankless Water Heater Propane, 4.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Indoor Use for Whole House

A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting.

SEE PRICE ON AMAZONView details

Search