Gas Tankless Water Heaters

Certified gas tankless (on-demand) water heaters — endless hot water limited by flow rate rather than tank size, with no standby tank losses.

79 certified models in this category.

Model Uniform Energy Factor (UEF)FuelFirst-hour ratingMax flow rateRated storage volumeSmart / connected capable
A. O. Smith ACTH-199M-(N,P) 1 0.95Natural Gas, Propane—5.8 GPM—No
A. O. Smith ATHR-160M 1 0.95Natural Gas, Propane—4.8 GPM—No
A. O. Smith ATHR-180M 1 0.95Natural Gas, Propane—5.3 GPM—No
A. O. Smith ATHR-199M 1 0.95Natural Gas, Propane—5.9 GPM—No
A. O. Smith ATM-160M-N 1 0.95Natural Gas—4.8 GPM—No
A. O. Smith ATM-160M-P 1-1 0.95Propane—4.8 GPM—No
A. O. Smith ATM-180M-N 1 0.95Natural Gas—5.4 GPM—No
A. O. Smith ATM-180M-P 1-1 0.95Propane—5.4 GPM—No
A. O. Smith ATM-199M-N 1 0.95Natural Gas—6 GPM—No
A. O. Smith ATM-199M-P 1-1 0.95Propane—6 GPM—No
A. O. Smith GT15TM-160M-N 1 0.95Natural Gas—4.8 GPM—No
A. O. Smith GT15TM-180M-N 1 0.95Natural Gas—5.4 GPM—No
A. O. Smith GT15TM-199M-N 1 0.95Natural Gas—6 GPM—No
A. O. Smith T-H3-OS-N 1 (ACT-199O-P 1-1) 0.95Propane—5.8 GPM—No
A. O. Smith T-H3J-OS-N (ATO-240H 1-1) 0.95Propane—4.7 GPM—No
A. O. Smith T-H3J-OS-N (ATO-240H 1) 0.95Natural Gas—4.7 GPM—No
A. O. Smith T-H3S-DV-N (ATI-340H 1-1) 0.95Propane—5.4 GPM—No
A. O. Smith T-H3S-DV-N (ATI-340H 1) 0.95Natural Gas—5.4 GPM—No
Bosch Greentherm (T9800 SE 160) 0.95Natural Gas, Propane—4.6 GPM—No
Bosch Greentherm (T9800 SE 199) 0.95Natural Gas, Propane—5.4 GPM—No
Bradford White RTGR150N1 0.98Natural Gas—4.3 GPM—No
Bradford White RTGR150X1 0.98Propane—4.3 GPM—No
Bradford White RTGR199N1 0.96Natural Gas—5.8 GPM—No
Bradford White RTGR199X1 0.96Propane—5.8 GPM—No
Friedrich FDTGH-S10I 0.96Natural Gas, Propane—5.2 GPM—No
Friedrich FDTGH-S11I 0.96Natural Gas, Propane—5.8 GPM—No
Friedrich FDTGH-S84I 0.96Natural Gas, Propane—4.6 GPM—No
Glow Brand T180 0.95Natural Gas, Propane———No
Kepler JSG48-29PCH/180K 0.96Natural Gas—5.2 GPM—No
Kepler JSG52-32PCH/199KNP 0.96Natural Gas—5.7 GPM—No
Kiturami KTGWH-180CWS1 0.95Natural Gas, Propane—5.2 GPM—No
Kiturami KTGWH-199CWP1 0.95Natural Gas, Propane—5.8 GPM—No
Midea JSG40-24PCH-LP 0.95Propane—4.4 GPM—No
Midea JSG40-24PCH-NG 0.95Natural Gas—4.4 GPM—No
Midea JSG48-29PCH-LP 0.95Propane—5.2 GPM—No
Midea JSG48-29PCH-NG 0.95Natural Gas—5.2 GPM—No
Midea JSG52-32PCH-LP 0.95Propane—5.7 GPM—No
Midea JSG52-32PCH-NG 0.95Natural Gas—5.7 GPM—No
Midea MGWH150IXNN 0.95Natural Gas—4.4 GPM—No
Midea MGWH150IXPN 0.95Propane—4.4 GPM—No
Midea MGWH180IXNN 0.95Natural Gas—5.2 GPM—No
Midea MGWH180IXPN 0.95Propane—5.2 GPM—No
Navien NPE-180A2 0.95Natural Gas, Propane—4.3 GPM—No
Navien NPE-180S2 0.96Natural Gas, Propane—4.4 GPM—No
Navien NPE-210A2 0.95Natural Gas, Propane—5 GPM—No
Navien NPE-210S2 0.96Natural Gas, Propane—5.3 GPM—No
Navien NPE-240A2 0.95Natural Gas, Propane—5.6 GPM—No
Navien NPE-240S2 0.96Natural Gas, Propane—5.8 GPM—No
Noritz EZ111DV (GQ-C3259WX-FF US) 0.96Natural Gas, Propane—5.8 GPM—No
Noritz EZ111DV (GQ-C3260WX-FF US) 0.96Natural Gas, Propane—5.6 GPM—No
Noritz EZ111DV (GQ-C3261WX-FF-1 US) 0.98Natural Gas, Propane—5.5 GPM—No
Noritz EZ71DV (GQ-C2661WX-FF-1 US) 0.98Natural Gas, Propane—4.7 GPM—No
Noritz EZ98DV (GQ-C2859WX-FF US) 0.96Natural Gas, Propane—5.3 GPM—No
Noritz EZ98DV (GQ-C2860WX-FF US) 0.96Natural Gas, Propane—5.6 GPM—No
Noritz EZ98DV (GQ-C2861WX-FF-1 US) 0.98Natural Gas, Propane—5.3 GPM—No
Noritz NCC199CDV (GQ-C3260WZ-FF US) 0.96Natural Gas, Propane—5.6 GPM—No
Noritz NRCR92DV (GQ-C2660WXQ-FF US) 0.95Natural Gas, Propane—4.9 GPM—No
Noritz NRCR92DV (GQ-C2661WXQ-FF-1 US) 0.98Natural Gas, Propane—4.7 GPM—No
Rheem ECOHS160IN 0.96Natural Gas—4.6 GPM—No
Rheem ECOHS160IP 0.96Propane—4.6 GPM—No
Rheem ECOHS180IN 0.96Natural Gas—5.2 GPM—No
Rheem ECOHS180IP 0.96Propane—5.2 GPM—No
Rheem ECOHS200IN 0.96Natural Gas—5.8 GPM—No
Rheem ECOHS200IP 0.96Propane—5.8 GPM—No
Rinnai CX160I REU-NB2530FFC-US 0.97Natural Gas, Propane—4.6 GPM—No
Rinnai CX199I REU-NB3237FFC-US 0.98Natural Gas, Propane—5.8 GPM—No
Rinnai RX130I REU-NB2024FF-US 0.97Natural Gas, Propane—3.8 GPM—No
Rinnai RX180I REU-NB2934FF-US 0.98Natural Gas, Propane—5.3 GPM—No
Takagi T-H3-OS-N 1 0.95Natural Gas—5.8 GPM—No
Takagi T-H3-OS-N 1 (TK-540X3-NEH 1) 0.95Natural Gas—5.8 GPM—No
Takagi T-H3-OS-N 1 (TK-540X3-PEH 1-1) 0.95Propane—5.8 GPM—No
Vesta VRP PLUS-150 0.95Natural Gas, Propane—4.7 GPM—No
Vesta VRP PLUS-150 (VTP-150) 0.96Natural Gas, Propane—4.7 GPM—No
Vesta VRP PLUS-199 0.96Natural Gas, Propane—6 GPM—No
Vesta VRP-150 0.95Natural Gas, Propane—4.3 GPM—No
Vesta VRS PLUS-150 0.96Natural Gas, Propane—4.6 GPM—No
Vesta VRS PLUS-199 0.96Natural Gas, Propane—5.9 GPM—No
Vesta VRS PLUS-199 (VTS-199) 0.96Natural Gas, Propane—5.9 GPM—No
Vesta VX 9 0.96Natural Gas, Propane—6 GPM—No