Best gas tankless water heater Deals Online in the US
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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.