Home / Types / Gas tankless Gas tankless water heaters The gas tankless group holds 367 certified model numbers in 40 rating sets, from 23 brands. The highest max flow on the list, 6.0 gal/min at a 67 °F rise, belongs to A. O. Smith ATM-199M-N 1 and Vesta VTP-199. The largest rating set here, A. O. Smith ACT-199O-N 1, covers 51 model numbers sold as A. O. Smith, American, Lochinvar, Reliance, State and Takagi. One ENERGY STAR partner, A.O. Smith Corporation, lists 56% of the group’s model numbers.
Certified models as of October 27, 2026 · Open this type in the Heater finder
Max flow against gas input
Max flow at a 67 °F rise, gal/min
Max flow against gas input 3.5 4.0 4.5 5.0 5.5 6.0 6.5 120 130 140 150 160 170 180 190 200 Gas input, thousand Btu/h A. O. Smith ACT-199O-N 1 A. O. Smith ATI-340H 1 A. O. Smith ATHR-160M 1 Rheem ECOHS200IN A. O. Smith ATO-240H 1 Rheem ECOHS160IN Rheem ECOHS180IN A. O. Smith ATM-199M-N 1 A. O. Smith ATHR-180M 1 A. O. Smith ATHR-199M 1 Bradford White RTGR150N1 Midea JSG52-32PCH-LP A. O. Smith ATM-140M-N 1 Midea JSG48-29PCH-LP Bosch T9800 SE 199 Noritz EZ111DV (GQ-C3261WX-FF US) Bosch T9800 SE 160 Midea MGWH150IXNN Rinnai (CX160I) REU-NB2530FFC-US Rinnai (CX199I) REU-NB3237FFC-US Kepler JSG52-32PCH/199KNP Noritz EZ111DV (GQ-C3260WX-FF US) Noritz EZ98DV (GQ-C2861WX-FF US) Midea JSG40-24PCH-LP Navien NPE-180A2 Noritz EZ71DV (GQ-C2661WX-FF US) Noritz NRCR92DV (GQ-C2661WXQ-FF US) Vesta VRS PLUS-199 Kepler JSG48-29PCH/180K Navien NPE-180S2 Navien NPE-210A2 Navien NPE-210S2 Navien NPE-240A2 Noritz EZ98DV (GQ-C2860WX-FF US) Noritz NRCR92DV (GQ-C2660WXQ-FF US) Rinnai (RX130I) REU-NB2024FF-US Vesta VRP-PLUS-150 Vesta VTP-150 Vesta VTP-199 Vesta VTS-150
Max flow against gas input 3.5 4.0 4.5 5.0 5.5 6.0 6.5 120 140 160 180 200 Gas input, thousand Btu/h A. O. Smith ACT-199O-N 1 A. O. Smith ATI-340H 1 A. O. Smith ATHR-160M 1 Rheem ECOHS200IN A. O. Smith ATO-240H 1 Rheem ECOHS160IN Rheem ECOHS180IN A. O. Smith ATM-199M-N 1 A. O. Smith ATHR-180M 1 A. O. Smith ATHR-199M 1 Bradford White RTGR150N1 Midea JSG52-32PCH-LP A. O. Smith ATM-140M-N 1 Midea JSG48-29PCH-LP Bosch T9800 SE 199 Noritz EZ111DV (GQ-C3261WX-FF US) Bosch T9800 SE 160 Midea MGWH150IXNN Rinnai (CX160I) REU-NB2530FFC-US Rinnai (CX199I) REU-NB3237FFC-US Kepler JSG52-32PCH/199KNP Noritz EZ111DV (GQ-C3260WX-FF US) Noritz EZ98DV (GQ-C2861WX-FF US) Midea JSG40-24PCH-LP Navien NPE-180A2 Noritz EZ71DV (GQ-C2661WX-FF US) Noritz NRCR92DV (GQ-C2661WXQ-FF US) Vesta VRS PLUS-199 Kepler JSG48-29PCH/180K Navien NPE-180S2 Navien NPE-210A2 Navien NPE-210S2 Navien NPE-240A2 Noritz EZ98DV (GQ-C2860WX-FF US) Noritz NRCR92DV (GQ-C2660WXQ-FF US) Rinnai (RX130I) REU-NB2024FF-US Vesta VRP-PLUS-150 Vesta VTP-150 Vesta VTP-199 Vesta VTS-150
Each circle is one rating set, sized by model numbers. Dashed line: input ÷ (8.34 × 60 × 67), the flow at which all of the gas input would go into a 67 °F rise. The test tolerances on inlet and outlet temperature let a few listings sit slightly above it. Every rating set Grouped by maximum gas input.
Gas tankless rating sets by gas input Rating set Max flow, 67 °F rise Gas input UEF, draw Gas use Fuel 199,000 Btu/h13 sets Vesta VTP-199 Show 1 model number 6.0 gal/min 199,000 Btu/h 0.96 high 176 therms/yr natural gas or propane A. O. Smith ATM-199M-N 1 Also listed as American, Lochinvar, Reliance, State Show 14 model numbers A. O. Smith ATM-199M-N 1**, ATM-199X3-N 1**, GT15TM-199M-N, GT15TM-199M-N 1**, GT15TM-199X3-N, GT15TM-199X3-N 1**American MTM-199M-N 1**, MTM-199X3-N 1**Lochinvar LTM-199M-N 1**, LTM-199X3-N 1**Reliance RTM-199M-N 1**, RTM-199X3-N 1**State STM-199M-N 1**, STM-199X3-N 1**6.0 gal/min 199,000 Btu/h 0.95 high 178 therms/yr natural gas only Vesta VRS PLUS-199 Show 2 model numbers Vesta VRS PLUS-199, VTS-1995.9 gal/min 199,000 Btu/h 0.96 high 176 therms/yr natural gas or propane A. O. Smith ATHR-199M 1 Also listed as American, Lochinvar, Reliance, State Show 12 model numbers A. O. Smith ATHR-199M 1**, ATHR-199X3 1**, GT15THR-199M 1**, GT15THR-199X3 1**American MTHR-199M 1**, MTHR-199X3 1**Lochinvar LTHR-199M 1**, LTHR-199X3 1**Reliance RTHR-199M 1**, RTHR-199X3 1**State STHR-199M 1**, STHR-199X3 1**5.9 gal/min 199,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Rinnai (CX199I) REU-NB3237FFC-US Show 4 model numbers Rinnai (CX199I) REU-NB3237FFC-US, (CXP199I) REU-NBP3237FFC-US, (RX199I) REU-NB3237FF-US, (RXP199I) REU-NBP3237FF-US5.8 gal/min 199,000 Btu/h 0.98 high 173 therms/yr natural gas or propane Rheem ECOHS200IN Also listed as Bradford White, Friedrich, Kiturami, Laars, Navien, Richmond, Ruud Show 35 model numbers Bradford White RTGR199N1**, RTGR199X1**, RTGS199N1**, RTGS199X1**Friedrich FDTGH-S11I, FDTGH-SR11IKiturami KGWH-190JFN, KGWH-190JFP, KGWH-199JFRN, KGWH-199JFRPLaars LT199NRX1**, LT199NXX1**, LT199PRX1**, LT199PXX1**Navien NPE-240S2Rheem ECOHS200IN, ECOHS200IP, ECOHSR200IN, ECOHSR200IP, RECTGH-S11IN, RECTGH-S11IP, RECTGH-SR11IN, RECTGH-SR11IP, RTGH-CS11I, RTGH-CSR11I, RTGH-S11I, RTGH-SR11IRichmond RMTGHS11IN, RMTGHS11IP, RMTGHSR11IN, RMTGHSR11IPRuud RUTGH-CS11I, RUTGH-CSR11I, RUTGH-S11I, RUTGH-SR11I5.8 gal/min 199,000 Btu/h 0.96 high 176 therms/yr natural gas or propane A. O. Smith ACT-199O-N 1 Also listed as American, Lochinvar, Reliance, State, Takagi Show 51 model numbers A. O. Smith ACT-199O-N 1**, ACT-199O-P 1*1, ACTH-199M-(N,P) 1**, ATO-540H 1**, ATO-540H 1*1, ATO-540HX3-N 1**, ATO-540HX3-P 1*1, ATO-540P-N 1**, ATO-540P-P 1*1, GT15-540-NO 1**American GT-540-NEH 1**, GT-540-PEH 1*1, GT-540P-NEH 1**, GT-540P-PEH 1*1, GT-540X3-NEH 1**, GT-540X3-PEH 1*1, MCT-199O-N 1**, MCT-199O-P 1*1, MCTH-199M-(N,P) 1**Lochinvar LCT-199O-N 1**, LCT-199O-P 1*1, LCTH-199M-(N,P) 1**, LTO-540H-N 1**, LTO-540H-P 1*1, LTO-540HX3-N 1**, LTO-540HX3-P 1*1, LTO-540P-N 1**, LTO-540P-P 1*1Reliance TS-540-GEH 1**, TS-540-LEH 1*1, TS-540P-GEH 1**, TS-540P-LEH 1*1, TS-540X3-GEH 1**, TS-540X3-LEH 1*1State GTS-540-NEH 1**, GTS-540-PEH 1*1, GTS-540P-NEH 1**, GTS-540P-PEH 1*1, GTS-540X3-NEH 1**, GTS-540X3-PEH 1*1, SCT-199O-N 1**, SCT-199O-P 1*1, SCTH-199M-(N,P) 1**Takagi T-H3-OS-N 1**, T-H3-OS-P 1*1, TCT-199O-N 1**, TCT-199O-P 1*1, TK-540P-NEH 1**, TK-540P-PEH 1*1, TK-540X3-NEH 1**, TK-540X3-PEH 1*15.8 gal/min 199,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Kepler JSG52-32PCH/199KNP Also listed as Kings Peak Show 3 model numbers Kepler JSG52-32PCH/199KNP, JSG52-32PCH/199KWPKings Peak KNG199ICW5.7 gal/min 199,000 Btu/h 0.96 high 175 therms/yr natural gas only Midea JSG52-32PCH-LP Also listed as MRCOOL, stream33 Show 12 model numbers MRCOOL MHWH199NCLU, MHWH199NCNUMidea JSG52-32PCH-LP, JSG52-32PCH-NG, JSG52-32PCHP-LP, JSG52-32PCHP-NG, MGWH199IXNN, MGWH199IXNP, MGWH199IXPN, MGWH199IXPPstream33 S33-95TWH199-LP/NG, S33-95TWH199P-LP/NG5.7 gal/min 199,000 Btu/h 0.95 high 175 therms/yr natural gas or propane Noritz EZ111DV (GQ-C3260WX-FF US) Show 3 model numbers Noritz EZ111DV (GQ-C3260WX-FF US), NCC199CDV (GQ-C3260WZ-FF US), NRCR111DV (GQ-C3260WXQ-FF US)5.6 gal/min 199,000 Btu/h 0.96 high 176 therms/yr natural gas or propane Navien NPE-240A2 Show 1 model number 5.6 gal/min 199,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Noritz EZ111DV (GQ-C3261WX-FF US) Show 6 model numbers Noritz EZ111DV (GQ-C3261WX-FF US), EZ111DV (GQ-C3261WX-FF-1 US), NCC199CDV (GQ-C3261WZ-FF US), NCC199CDV (GQ-C3261WZ-FF-1 US), NRCR111DV (GQ-C3261WXQ-FF US), NRCR111DV(GQ-C3261WXQ-FF-1 US)5.5 gal/min 199,000 Btu/h 0.98 high 173 therms/yr natural gas or propane Bosch T9800 SE 199 Also listed as Bradford White Show 6 model numbers Bosch T9800 SE 199, T9800 SEO 199, T9900 SE 199Bradford White RTG-K-199N1, RTG-K-199N2, RTGL 199N15.4 gal/min 199,000 Btu/h 0.95 high 178 therms/yr natural gas or propane 170,000 to 189,000 Btu/h9 sets Noritz EZ98DV (GQ-C2860WX-FF US) Show 1 model number Noritz EZ98DV (GQ-C2860WX-FF US)5.6 gal/min 180,000 Btu/h 0.96 high 176 therms/yr natural gas or propane A. O. Smith ATI-340H 1 Also listed as American, Lochinvar, Reliance, State, Takagi Show 40 model numbers A. O. Smith ATI-340H 1**, ATI-340H 1*1, ATI-340HX3-N 1**, ATI-340HX3-P 1*1, ATM-180M-N 1**, ATM-180X3-N 1**, GT15-340-NI 1**, GT15-340-PI 1*1, GT15TM-180M-N, GT15TM-180M-N 1**, GT15TM-180X3-N, GT15TM-180X3-N 1**American GT-340-NIH 1**, GT-340-PIH 1*1, GT-340X3-NIH 1**, GT-340X3-PIH 1*1, MTM-180M-N 1**, MTM-180X3-N 1**Lochinvar LTI-340H-N 1**, LTI-340H-P 1*1, LTI-340X3-N 1**, LTI-340X3-P 1*1, LTM-180M-N 1**, LTM-180X3-N 1**Reliance RTM-180M-N 1**, RTM-180X3-N 1**, TS-340-GIH 1**, TS-340-LIH 1*1, TS-340X3-GIH 1**, TS-340X3-LIH 1*1State GTS-340-NIH 1**, GTS-340-PIH 1*1, GTS-340X3-NIH 1**, GTS-340X3-PIH 1*1, STM-180M-N 1**, STM-180X3-N 1**Takagi T-H3S-DV-N 1**, T-H3S-DV-P 1*1, TK-340X3-NIH 1**, TK-340X3-PIH 1*15.4 gal/min 180,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Noritz EZ98DV (GQ-C2861WX-FF US) Also listed as Rinnai Show 3 model numbers Noritz EZ98DV (GQ-C2861WX-FF US), EZ98DV (GQ-C2861WX-FF-1 US)Rinnai (RX180I) REU-NB2934FF-US5.3 gal/min 180,000 Btu/h 0.98 high 173 therms/yr natural gas or propane Navien NPE-210S2 Show 1 model number 5.3 gal/min 180,000 Btu/h 0.96 high 176 therms/yr natural gas or propane A. O. Smith ATHR-180M 1 Also listed as American, Lochinvar, Reliance, State Show 12 model numbers A. O. Smith ATHR-180M 1**, ATHR-180X3 1**, GT15THR-180M 1**, GT15THR-180X3 1**American MTHR-180M 1**, MTHR-180X3 1**Lochinvar LTHR-180M 1**, LTHR-180X3 1**Reliance RTHR-180M 1**, RTHR-180X3 1**State STHR-180M 1**, STHR-180X3 1**5.3 gal/min 180,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Kepler JSG48-29PCH/180K Show 1 model number 5.2 gal/min 180,000 Btu/h 0.96 high 175 therms/yr natural gas only Rheem ECOHS180IN Also listed as Friedrich, Richmond, Ruud Show 18 model numbers Friedrich FDTGH-S10I, FDTGH-SR10IRheem ECOHS180IN, ECOHS180IP, ECOHSR180IN, ECOHSR180IP, RECTGH-S10IN, RECTGH-S10IP, RECTGH-SR10IN, RECTGH-SR10IP, RTGH-S10I, RTGH-SR10IRichmond RMTGHS10IN, RMTGHS10IP, RMTGHSR10IN, RMTGHSR10IPRuud RUTGH-S10I, RUTGH-SR10I5.2 gal/min 180,000 Btu/h 0.96 high 176 therms/yr natural gas or propane Midea JSG48-29PCH-LP Show 8 model numbers Midea JSG48-29PCH-LP, JSG48-29PCH-NG, JSG48-29PCHP-LP, JSG48-29PCHP-NG, MGWH180IXNN, MGWH180IXNP, MGWH180IXPN, MGWH180IXPP5.2 gal/min 180,000 Btu/h 0.95 high 175 therms/yr natural gas or propane Navien NPE-210A2 Show 1 model number 5.0 gal/min 180,000 Btu/h 0.95 high 178 therms/yr natural gas or propane 160,000 to 169,000 Btu/h7 sets Noritz NRCR92DV (GQ-C2660WXQ-FF US) Show 1 model number Noritz NRCR92DV (GQ-C2660WXQ-FF US)4.9 gal/min 165,000 Btu/h 0.95 high 178 therms/yr natural gas or propane A. O. Smith ATHR-160M 1 Also listed as American, Lochinvar, Reliance, State Show 38 model numbers A. O. Smith ATHR-160M 1**, ATHR-160X3 1**, ATM-160M-N 1**, ATM-160M-P 1*1, ATM-160X3-N 1**, ATM-160X3-P 1*1, GT15THR-160M 1**, GT15THR-160X3 1**, GT15TM-160M-N, GT15TM-160M-N 1**, GT15TM-160M-P 1*1, GT15TM-160X3-N, GT15TM-160X3-N 1**, GT15TM-160X3-P 1*1American MTHR-160M 1**, MTHR-160X3 1**, MTM-160M-N 1**, MTM-160M-P 1*1, MTM-160X3-N 1**, MTM-160X3-P 1*1Lochinvar LTHR-160M 1**, LTHR-160X3 1**, LTM-160M-N 1**, LTM-160M-P 1*1, LTM-160X3-N 1**, LTM-160X3-P 1*1Reliance RTHR-160M 1**, RTHR-160X3 1**, RTM-160M-N 1**, RTM-160M-P 1*1, RTM-160X3-N 1**, RTM-160X3-P 1*1State STHR-160M 1**, STHR-160X3 1**, STM-160M-N 1**, STM-160M-P 1*1, STM-160X3-N 1**, STM-160X3-P 1*14.8 gal/min 160,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Noritz EZ71DV (GQ-C2661WX-FF US) Show 2 model numbers Noritz EZ71DV (GQ-C2661WX-FF US), EZ71DV (GQ-C2661WX-FF-1 US)4.7 gal/min 160,000 Btu/h 0.98 high 173 therms/yr natural gas or propane Noritz NRCR92DV (GQ-C2661WXQ-FF US) Show 2 model numbers Noritz NRCR92DV (GQ-C2661WXQ-FF US), NRCR92DV (GQ-C2661WXQ-FF-1 US)4.7 gal/min 165,000 Btu/h 0.98 high 173 therms/yr natural gas or propane A. O. Smith ATO-240H 1 Also listed as American, Lochinvar, Reliance, State, Takagi Show 26 model numbers A. O. Smith ATO-240H 1**, ATO-240H 1*1, ATO-240HX3-N 1**, ATO-240HX3-P 1*1, GT15-240-NO 1**, GT15-240-PO 1*1American GT-240-NEH 1**, GT-240-PEH 1*1, GT-240X3-NEH 1**, GT-240X3-PEH 1*1Lochinvar LTO-240H-N 1**, LTO-240H-P 1*1, LTO-240X3-N 1**, LTO-240X3-P 1*1Reliance TS-240-GEH 1**, TS-240-LEH 1*1, TS-240X3-GEH 1**, TS-240X3-LEH 1*1State GTS-240-NEH 1**, GTS-240-PEH 1*1, GTS-240X3-NEH 1**, GTS-240X3-PEH 1*1Takagi T-H3J-OS-N 1**, T-H3J-OS-P 1*1, TK-240X3-NEH 1**, TK-240X3-PEH 1*14.7 gal/min 160,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Rinnai (CX160I) REU-NB2530FFC-US Show 4 model numbers Rinnai (CX160I) REU-NB2530FFC-US, (CXP160I) REU-NBP2530FFC-US, (RX160I) REU-NB2530FF-US, (RXP160I) REU-NBP2530FF-US4.6 gal/min 160,000 Btu/h 0.97 high 175 therms/yr natural gas or propane Bosch T9800 SE 160 Also listed as Bradford White Show 5 model numbers Bosch T9800 SE 160, T9800 SEO 160, T9900 SE 160Bradford White RTG-K-160N1, RTG-K-160N24.6 gal/min 160,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Under 160,000 Btu/h11 sets Vesta VTP-150 Show 1 model number 4.7 gal/min 150,000 Btu/h 0.96 high 176 therms/yr natural gas or propane Vesta VRP-PLUS-150 Show 1 model number 4.7 gal/min 150,000 Btu/h 0.95 high 178 therms/yr natural gas or propane Rheem ECOHS160IN Also listed as Friedrich, Richmond, Ruud Show 18 model numbers Friedrich FDTGH-S84I, FDTGH-SR84IRheem ECOHS160IN, ECOHS160IP, ECOHSR160IN, ECOHSR160IP, RECTGH-S84IN, RECTGH-S84IP, RECTGH-SR84IN, RECTGH-SR84IP, RTGH-S84I, RTGH-SR84IRichmond RMTGHS84IN, RMTGHS84IP, RMTGHSR84IN, RMTGHSR84IPRuud RUTGH-S84I, RUTGH-SR84I4.6 gal/min 157,000 Btu/h 0.96 high 176 therms/yr natural gas or propane Vesta VTS-150 Show 1 model number 4.6 gal/min 150,000 Btu/h 0.96 high 176 therms/yr natural gas or propane Navien NPE-180S2 Show 1 model number 4.4 gal/min 150,000 Btu/h 0.96 high 176 therms/yr natural gas or propane Midea JSG40-24PCH-LP Show 2 model numbers Midea JSG40-24PCH-LP, JSG40-24PCH-NG4.4 gal/min 150,000 Btu/h 0.95 high 177 therms/yr natural gas or propane Midea MGWH150IXNN Show 4 model numbers Midea MGWH150IXNN, MGWH150IXNP, MGWH150IXPN, MGWH150IXPP4.4 gal/min 150,000 Btu/h 0.95 high 175 therms/yr natural gas or propane Bradford White RTGR150N1 Also listed as Kiturami, Laars Show 12 model numbers Bradford White RTGR150N1, RTGR150X1, RTGS150N1, RTGS150X1Kiturami KGWH-150JFN, KGWH-150JFP, KGWH-150JFRN, KGWH-150JFRPLaars LT150NRX1, LT150NXX1, LT150PRX1, LT150PXX14.3 gal/min 150,000 Btu/h 0.98 high 173 therms/yr natural gas or propane Navien NPE-180A2 Also listed as Vesta Show 2 model numbers Navien NPE-180A2Vesta VRP-1504.3 gal/min 150,000 Btu/h 0.95 high 178 therms/yr natural gas or propane A. O. Smith ATM-140M-N 1 Also listed as American, Lochinvar, Reliance, State Show 11 model numbers A. O. Smith ATM-140M-N 1**, ATM-140X3-N 1**, GT15TM-140M-N 1**American MTM-140M-N 1**, MTM-140X3-N 1**Lochinvar LTM-140M-N 1**, LTM-140X3-N 1**Reliance RTM-140M-N 1**, RTM-140X3-N 1**State STM-140M-N 1**, STM-140X3-N 1**4.1 gal/min 140,000 Btu/h 0.95 high 178 therms/yr natural gas only Rinnai (RX130I) REU-NB2024FF-US Show 1 model number Rinnai (RX130I) REU-NB2024FF-US3.8 gal/min 130,000 Btu/h 0.97 medium 114 therms/yr natural gas or propane
Model numbers in that set, by brand
Rheem 12 Bradford White 4 Kiturami 4 Laars 4 Richmond 4 Ruud 4 Friedrich 2 Navien 1 By gas input Gas input Rating sets Model numbers Max flow range Median max flow 199,000 Btu/h 13 150 5.4–6.0 gal/min 5.8 gal/min 170,000 to 189,000 Btu/h 9 85 5.0–5.6 gal/min 5.3 gal/min 160,000 to 169,000 Btu/h 7 78 4.6–4.9 gal/min 4.7 gal/min Under 160,000 Btu/h 11 54 3.8–4.7 gal/min 4.4 gal/min
Medians count each rating set once.
Fuel listing
151 103 113 Counted by model number. Separate natural-gas and propane versions of one heater usually carry their own model numbers.