Best gas tankless water heater Deals Online in the US
Filter
Top relevant- Best Choice
25% OffRanein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water HeaterRanein - Best Value
20% OffThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Heatingthermomate 
18L 5GPM Natural /Propane Gas Hot Water Heater Tankless On-Demand Instant Boiler
SNDOAS Tankless Water Heater,16L On Demand Water Heater Natural Gas, 4.23 GPM 85,300BTU Instant Hot Water, LED Display, Indoor Installation, 2-3 Point Use for Family Bathroom Kitchen,WhiteSNDOAS
120,000 BTU Outdoor Tankless Water Heater Propane Gas 5.1 GPM Instant Hot Water
16% OffRheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUsRheem
Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom KitchenNOVIEEX-
130,000 BTU Propane Gas Tankless Water Heater 4.3 GPM Instant Hot Water Heater
-
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTURinnai
-
TAKAGI TK-110U-1 200 Ultra Low-NOx Non-Condensing Indoor Tankless Water Heater
-
Tankless Water Heater Natural Gas, Max 4.3 GPM, 100,000 BTU Indoor, Instant Hot Gas water Heater with Vent Pipe, 2-3 Points Whole House, within 1℉ Stable Temp, Easy to Install, Multi-ProtectionQERPRE
-
FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S Series, New UpgradedFOGATTI
-
Navien NPE-240A2 Natural Gas High Efficiency Tankless Water Heater **FREE SHIP**
-
Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless SteelRheem
-
Tankless Water Heater Gas,Up to 4.75GPM 18L Water Heater Natural Gas with LED...
-
Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, GrayRheem
-
Rinnai RXP199iN Tankless Water Heater 199k BTU Nat Gas/Propane (B-11 #1513)
-
APUS Natural Gas Tankless Water Heater 140,000 BTU Indoor Installation Up to 6.8 GPM, Zero Cold Water for Technology Instant Hot Water on Demand, Smart Wi-Fi App ControlAPUS
-
Tankless Propane Gas Hot Water Heater On-Demand Instant Gas Pressure 2800 Pa
-
14% OffVEVOR Gas Tankless Water Heater, 4.3Gal Indoor 100000 BTU Instant Hot Water Heater, Smart Temperature Control & Clear LED Display & Multiple Security Protections for Whole House,Silver GrayVEVOR
-
18L 5GPM Natural Gas Tankless Water Heater Indoor Installation Instant Hot Water
-
Rinnai V53DeN Natural Gas Tankless Water Heater - 5.3 GPM, Outdoor InstallationRinnai
-
Rheem Tankless Water Heater ECOH200DVRHLN Perform Platinum 11 GPM Natural Gas
-
Rinnai V53DeN Natural Gas Tankless Water Heater - 5.3 GPM, Outdoor InstallationUsedRinnai
-
18L 36KW LPG Propane Gas Tankless Hot Water Heater On-Demand Instant Boiler 5GPM
-
APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space GrayAPUS
-
EZ Tankless 101 2.0 GPM 42,500 BTU Propane Gas Portable Tankless Water Heater
-
Natural Gas Tankless Water Heater, 4.21GPM 16L Indoor,Constant propane water heater,Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display,Multi-Protectionforimo
-
Rinnai RE140eP Outdoor Tankless Water Heater Propane Gas 140K BTU (B-18 #1527)
-
20% OffORBEK Natural Gas Tankless Water Heater - Max 4.3 GPM 100,000 BTU Indoor Installation - CSA Certified On-Demand Instant Hot Water Heater 3/4" NPT Connector SizeOrbek
-
Uimoso Natural Gas Tankless Hot Water Heater 120,000 BTU Instant Outdoor 5.3 gal
-
ORBEK Natural Gas Tankless Water Heater - Max 4.3 GPM 100,000 BTU Indoor Installation - CSA Certified On-Demand Instant Hot Water Heater 3/4" NPT Connector SizeOrbek
-
Tankless Water Heater Propane Gas Outdoor 5.1 GPM 120,000 BTU Instant Hot Water
-
Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 7.0 GPM, 160,000 BTUsRheem
-
VEVOR Gas Tankless Water Heater, 5.3Gal Outdoor 120000 BTU Instant Hot Water Heater, Smart Temperature Control & 3/4 inch NPT Interface& Multiple Security Protections for Whole House, Silver GrayVEVOR
-
MIZUDO Natural Gas Tankless Water Heater, Indoor or Outdoor Convertible Installation, Max 5.1 GPM 120,000 BTU, WiFi&APP Control CSA Certified for Large Families Whole House, GEN 3MIZUDO
-
20% OffGEN II Ranein Propane Gas Tankless Water Heater Max 4.3 GPM, 100,000 BTU Indoor On Demand Instant Hot Water Heater with LED Temperature Control PanelRanein
-
Natural Gas Tankless Water Heater, 4.21GPM 16L Indoor,Instant Hot Natural Gas Water Heater with Multi-ProtectionVELPAX
-
RIWORY 102000 BTU Natural Gas Tankless Water Heater, Max 4.3 GPM Intelligent Constant Indoor Instant Gas On Demand Hot Water Heater Tankless with Freeze Protection, 3/4" NPT, for 3-4 Water PointsRIWORY
-
20% OffGEN II Ranein Natural Gas Tankless Water Heater Max 3.6 GPM, 80,000 BTU Indoor On Demand Instant Hot Water Heater with LED Temperature Control PanelRanein
-
Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless SteelRheem
-
SNDOAS Tankless Water Heater Gas,Up to 4.75GPM 18L Water Heater Natural Gas with LED Display,102,000 BTU Instant Hot Water Heater On Demand for Whole House,Ultra Quiet,Forced Exhaust,Indoor UseSNDOAS
-
23% OffWestinghouse Natural Gas Tankless Water Heater Outdoor Installation Max 8.1 GPM 180,000 BTU, Temp Self Modulating Non Condensing High Efficiency Water Heater for House or Commercial, APOLO PerformanceWestinghouse
-
Westinghouse Natural Gas Tankless Water Heater Outdoor Installation Max 8.1 GPM 180,000 BTU, Temp Self Modulating Non Condensing High Efficiency Water Heater for House or Commercial, APOLO PerformanceWestinghouse
-
GASLAND Gasmart E 199000 BTU Tankless Water Heater, Up to 7.6 GPM, Whole House Natural Gas Indoor Installation Residential On-demand Instant Hot Water Heater, CE686NGGASLAND
-
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater 7.0 GPM, 160,000 BTUsRheem
-
Rinnai RE180iN Non-Condensing Natural Gas Tankless Water Heater, Up to 8.5 GPM, Indoor Installation, 180,000 BTURinnai
-
Tankless Water Heater Natural Gas, 4.74 GPM 18L Indoor Instant Hot Water Heater with Digital Fahrenheit Display Multi-Protection Constant Temperature for Home & Apartmentforimo
-
10% OffLIULO TOOL 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit, with Pressure Relief Valve, Clean BrassLIULO TOOL
-
LIULO TOOL 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit, with Pressure Relief Valve, Clean BrassLIULO TOOL
-
Natural Gas Tankless Water Heater Indoor,HeatRova 4.3 GPM 102,000 BTU,Instant Hot Water,Constant Temperature,Pure Copper Heat Exchanger,3/4" NPT Connector,Energy-Saving,On-Demand for 3–4 FixturesHeatrova
-
HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean BrassHYDRO MASTER
-
Rheem RTG-70DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater 7.0 GPM, 160,000 BTUsRheem
-
ThermoMate CZ480NG 5.28GPM Condensing Tankless Water Heater, 0.86 UEF High Efficiency Instant On-Demand Hot Water, Residential Indoor Natural Gas Water Heater with Multi-Point Heatingthermomate
-
Tankless Water Heater Natural Gas,4.21GPM 16L Indoor,Instant Hot Gas Water Heater, with Fahrenheit Digital Display,Multi-Protection (Black)Usedforimo
-
FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S SeriesFOGATTI
-
15% OffTankless Water Heater Propane Gas, 18L Instant Hot Water Heater with Fahrenheit Digital Display, Indoor Installation Up to 4.76GPM, 122837BTUNessxa
-
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 BarnAmzgachfktch
-
CAMPLUX 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit, with Pressure Relief Valve, Clean Brass ConstructionCAMPLUX ENJOY OUTDOOR LIFE
-
CAMPLUX 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit, with Pressure Relief Valve, Clean Brass ConstructionUsedCAMPLUX ENJOY OUTDOOR LIFE
-
14% OffPortable Water Heater Propane Tankless - 6L 1.58GPM RV on demand Hot Gas Outdoor Digital Display Water Heater for Camping,Boat,CabinsRUINOPAR
-
Portable Water Heater Propane Tankless - 6L 1.58GPM RV on demand Hot Gas Outdoor Digital Display Water Heater for Camping,Boat,CabinsRUINOPAR
-
VEVOR Gas Tankless Water Heater, 8Gal Outdoor 191000 BTU Instant Hot Water Heater, Smart Temperature Control & 3/4 inch NPT Interface& Multiple Security Protections for Whole House, Silver GrayVEVOR
-
Tankless Water Heater Propane 4.74GPM 18L Outdoor Portable GasHot Water Heater Instant Propane Water Heater with Digital Display Multi-Protection for Camping Trips Boatforimo
-
10% OffAPUS 190,000 BTU Outdoor Tankless Water Heater, 8.1 GPM Propane Instant Hot Water Heater with WiFi & Remote Control, High Efficiency for Supports 5 OutletsAPUS
-
10% OffCAMPLUX Climatech 7 Tankless Water Heater Gas Indoor 6.86 GPM Up to 7.6 GPM, 170,000 BTU On Demand Instant Tankless Hot Water Heater Natural Gas, Indoor Installation, White, CA686WCAMPLUX ENJOY OUTDOOR LIFE
-
Rinnai CX199iN Condensing Smart Sense Commercial Natural Gas or Propane Tankless Water Heater, 199,000 BTU, 11.1 GPMRinnai
-
Rinnai CU160eN Commercial Natural Gas Condensing Tankless Water Heater, Outdoor Installation, 9 GPMRinnai
-
14% OffRheem IKONIC RECTGH-SR10iN Professional Grade Super High Efficiency Condensing Tankless Natural Gas Water Heater with Recirculation, 10.1 GPMRheem
-
A. O. Smith Tankless Water Heater Gas - On Demand Hot Water - Indoor - 8 GPM - Non-Condensing Natural Gas with X3 Scale Prevention Technology - 190,000 BTU ProLine XE Concentric Vent - ATI-310CX3AO Smith
-
Rinnai REP199iN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater with Built-In Recirculation Pump, Up to 7.9 GPM, Indoor Installation, 199,000 BTURinnai
-
CAMPLUX Climatech 5 Tankless Water Heater Gas Outdoor 5.28 GPM Up to 6.4 GPM, 150,000 BTU On Demand Instant Tankless Hot Water Heater Natural Gas, Outdoor Installation, White, WA528, CSACAMPLUX ENJOY OUTDOOR LIFE
-
CAMPLUX Climatech 5 Tankless Water Heater Gas Outdoor 5.28 GPM Up to 6.4 GPM, 150,000 BTU On Demand Instant Tankless Hot Water Heater Natural Gas, Outdoor Installation, White, WA528, CSACAMPLUX ENJOY OUTDOOR LIFE
-
Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor InstallationRinnai
-
Propane Tankless Water Heater, 4.74GPM 18L Indoor,Constant propane water heater,Instant Hot Propane Gas water heater with Multi-ProtectionVELPAX
-
33% OffCAMPLUX Climatech 3 Tankless Water Heater Propane 3.6 GPM, 82,000 BTU High Efficiency Instant On-Demand Hot Water, 2-3 Points Gas Tankless Water Heater Indoor, White, CX360CAMPLUX ENJOY OUTDOOR LIFE
-
Rinnai RUCS65IN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Indoor InstallationRinnai
-
8L Tankless Water Heater Propane with Digital Display, 2.11 GPM Portable Instant Hot Gas RV Water Heater with Overheating Protection for Indoor and Camping,40,824 BTUBaotree
-
Tankless Water Heater Propane, 4.76 GPM RV Water Heater with Digital Display,18L Portable Instant Hot Gas Water Heater with Overheating Protection for Indoor and Camping,115,425 BTUBaotree
-
17% OffNatural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 85,000 BTU On Demand Instant Hot Water Heater Natural Gas with LED Temperature Control Panel, 1/2" NPT Connector Size, CSA Certified, GrayLiberLive
-
Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater, 9.5 GPM with WiFiRheem
-
MIZUDO Natural Gas Tankless Water Heater Outdoor Installation Max 5.1 GPM 120,000 BTU CSA Certified Constant Temp High Power On Demand Hot Water Heater for Big Family Whole House, Gen 2MIZUDO
-
Nessxa Tankless Water Heater Propane with Digital Display, 4.76 GPM 18L Portable Instant Hot Gas Water Heater with Overheating Protection for Indoor and Camping,115,425 BTUNessxa
-
Rheem Prestige High Efficiency 9.5GPM Indoor Natural Gas Tankless Water HeaterRheem
-
Camplux Tankless Water Heater, 1.32 GPM Portable Propane Outdoor Camping Water Heater, 5L, AY132, WhiteCAMPLUX ENJOY OUTDOOR LIFE
-
Camplux Tankless Water Heater, 1.32 GPM Portable Propane Outdoor Camping Water Heater, 5L, AY132, WhiteUsedCAMPLUX ENJOY OUTDOOR LIFE
-
17% OffORBEK ORBEK 60,000 BTU RV Tankless Water Heater, Ideal for RV Families & Campers, Propane Gas On-Demand Instant Hot Water Heater, 12V DC, CSA Certified, with Remote Control, Compatible with All RVsOrbek
-
FOGATTI Propane Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S SeriesFOGATTI
-
23% OffGASLAND Gasmart C 150,000 BTU, 5.28 GPM CSA Certified Whole House Natural Gas Tankless Water Heater | Instant Hot Water Heater, CS528NGGASLAND
-
SNDOAS Tankless Hot Water Heater Natural Gas, 4.23 GPM 16L Tankless Water Heater Indoor Use,85,300 BTU Forced Exhaust Instant Hot Water Heater,LED Display,Whole House, Multi-Protection,BlackSNDOAS
-
Rheem Prestige Condensing Tankless Gas Indoor Natural Gas Water Heater With Built-in Recirculation 11.0 GPM - RTGH-RH11DVLNRheem
-
Noritz GQ-C3261WX-FF US NG EZ Series Pro 11.1 GPM 199,900 BTU 120 Volt Residential Indoor/Outdoor Natural Gas Tankless Water Heater with Bluetooth Connectivity - SilverNoritz
-
17% OffTankless Gas Water Heater with Antifreeze Protection- 2.4GPM, WhiteFurrion
-
CAMPLUX Climatech 5 Tankless Water Heater Gas Outdoor 199,000 BTU, 6.86 GPM Instant On Demand Gas Tankless Hot Water Heater Natural Gas, 4-8 Points Whole House, Outdoor Installation, WA686MCAMPLUX ENJOY OUTDOOR LIFE
-
TENGCHANG 10L 2.6 GPM LPG Gas Propane Instant Tankless Hot Water Heater 61000 BTUTENGCHANG
-
15% OffTankless Water Heater Propane, 4.76 GPM RV Water Heater with Digital Display,18L Portable Instant Hot Gas Water Heater with Overheating Protection for Indoor and Camping,115,425 BTUBaotree
-
Rinnai RSC199eN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Outdoor Installation, 199,000 BTUUsedRinnai
-
GASLAND BS158 Outdoor Portable Gas Water Heater 1.58GPM, 6L Propane Tankless Water Heater for RV Camping Cabin Boat, Overheating Protection, Easy to Install, WhiteGASLAND
-
Rinnai RUR160eN Condensing Tankless Hot Water Heater, 9 GPM, Natural Gas, Outdoor InstallationRinnai
-
Rinnai RSC160iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 9 GPM, Indoor Installation, 160,000 BTURinnai
-
17% OffGASLAND Gasmart E 150000 BTU Tankless Gas Water Heater, Up to 5.8 GPM, Whole House Propane Indoor Installation Residential On-demand Instant Hot Water Heater, CE528LPGASLAND
-
CAMPLUX Gas Tankless Water Heater Indoor, 2.64 GPM, CM264 Propane Tankless Water Heater, 68,000 BTU On Demand Instant Hot Water, BlackCAMPLUX ENJOY OUTDOOR LIFE
-
CAMPLUX Gas Tankless Water Heater Indoor, 2.64 GPM, CM264 Propane Tankless Water Heater, 68,000 BTU On Demand Instant Hot Water, BlackCAMPLUX ENJOY OUTDOOR LIFE
-
Rheem Prestige Condensing Tankless Gas Indoor Natural Gas Water Heater With Built-in Recirculation 10.0 GPM - RTGH-RH10DVLNRheem
-
Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater, 6.6 GPM - Natural GasNoritz
-
Noritz NR98SVNG 7.5 GPM Indoor/Outdoor Tankless Natural Gas Water HeaterNoritz
-
Reliance TS-540-GIH 199K Indoor Tankless Natural Gas Water HeaterReliance
-
Portable Water Heater Propane Tankless,6L 1.58GPM Outdoor Instant Gas Water Heater with LED Display for RV, Camping,Outdoor Shower(Black)AUODGDNT
-
Portable Water Heater Propane Tankless,6L 1.58GPM Outdoor Instant Gas Water Heater with LED Display for RV, Camping,Outdoor Shower(Black)AUODGDNT
-
Flame King Portable Tankless Water Heater Propane Gas 10L 2.64 GPM at 68,000 BTU, Outdoor Instant Hot Water Shower for RV, Camping, Farm, CabinsFlame King
-
EZ 101 Outdoor Tankless Water Heater - Propane (LPG) Gas - 2 GPM - Small - Portable - Point of use - Battery Powered Ignition - Camping - RV - HuntingEZ Tankless
-
24% OffSyfuulv Propane Water Heater Tankless, 1.58GPM 6L Outdoor Portable Propane Gas Instant Hot water heater On Demand, 41,000 BTU, Overheating Protection, Camping, RV, Cabin, Barn, Blacksyfuulv
-
RecPro RV Tankless Water Heater | On Demand Hot | 42,000 BTU | Gas Water Heater | Remote Control Included (15" x 15" Door Size, Black)RecPro
-
OEVANT Propane Water Heater, 1.58GPM 6L Portable Tankless Water Heater with Handle & Overheating Protection, Propane Gas, Instant Hot Water for RV Camping, Outdoor Shower (WHITE)OEVANT
-
12% OffNessxa Tankless Water Heater Propane with Digital Display, 3.66 GPM 14L Portable Instant Hot Gas Water Heater with Overheating Protection for Indoor and Camping,85300 BTUNessxa
115 Gas Tankless Water Heater deals are available from:
Amazon, eBay stores, starting from $41.99.
The biggest discount we found is 33% on CAMPLUX Climatech 3 Tankless Water Heater Propane 3.6 GPM, 82,000 BTU High Efficiency Instant On-Demand Hot Water, 2-3 Points Gas Tankless Water Heater Indoor, White, CX360 at Amazon.
The lowest price we found is $41.99 while the highest is $2,108.34.
Prices for the best Gas Tankless Water Heater deals average at $584.70.
Last updated on April 4, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Gas Tankless Water Heater.