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Navien NPE-240A2

Ranked #34 of 40 in Best Gas Tankless Water Heaters (2026). Here is every spec we scored, where it came from, and how it compares.

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Navien NPE-240A2 head-to-head

Camplux RP199iB
8.7/10
#1 · Official UEF 0.98, maximum 5.8 GPM, minimum activation 0.6 GPM, ENERGY STAR connected-capable
Camplux RT199iB
8.7/10
#2 · Official UEF 0.98, maximum 5.8 GPM, minimum activation 0.6 GPM, ENERGY STAR connected-capable
Rinnai CX199I
8.1/10
#3 · Official UEF 0.98, maximum 5.8 GPM, minimum activation 0.1 GPM
Rinnai CXP199I
8.1/10
#4 · Official UEF 0.98, maximum 5.8 GPM, minimum activation 0.1 GPM
Rinnai RX199I
8.1/10
#5 · Official UEF 0.98, maximum 5.8 GPM, minimum activation 0.1 GPM
Rinnai RX180I
7.4/10
#6 · Official UEF 0.98, maximum 5.3 GPM, minimum activation 0.1 GPM
Noritz NCC199CDV (GQ-C3261WZ-FF US)
7.1/10
#7 · Official UEF 0.98, maximum 5.5 GPM, minimum activation 0.4 GPM
Noritz NRCR111DV (GQ-C3261WXQ-FF US)
7.1/10
#8 · Official UEF 0.98, maximum 5.5 GPM, minimum activation 0.4 GPM
Noritz NRCR92DV (GQ-C2661WXQ-FF US)
5.9/10
#9 · Official UEF 0.98, maximum 4.7 GPM, minimum activation 0.4 GPM
Vesta VTP-199
5.3/10
#10 · Official UEF 0.96, maximum 6 GPM, minimum activation 0.5 GPM
Rheem RTGH-S11I
5.2/10
#11 · Official UEF 0.96, maximum 5.8 GPM, minimum activation 0.4 GPM
Rinnai CX160I
5.2/10
#12 · Official UEF 0.97, maximum 4.6 GPM, minimum activation 0.1 GPM
Rinnai RX160I
5.2/10
#13 · Official UEF 0.97, maximum 4.6 GPM, minimum activation 0.1 GPM
Bradford White RTGR150N1
5.1/10
#14 · Official UEF 0.98, maximum 4.3 GPM, minimum activation 0.5 GPM
Kiturami KGWH-150JFN
5.1/10
#15 · Official UEF 0.98, maximum 4.3 GPM, minimum activation 0.5 GPM
Kiturami KGWH-190JFN
5.0/10
#16 · Official UEF 0.96, maximum 5.8 GPM, minimum activation 0.5 GPM
Kepler JSG52-32PCH/199KNP
4.7/10
#17 · Official UEF 0.96, maximum 5.7 GPM, minimum activation 0.6 GPM
Rheem RTGH-S10I
4.4/10
#18 · Official UEF 0.96, maximum 5.2 GPM, minimum activation 0.4 GPM
Rinnai RX130I
4.1/10
#19 · Official UEF 0.97, maximum 3.8 GPM, minimum activation 0.1 GPM
Navien NPE-240S2
4.0/10
#20 · Official UEF 0.96, maximum 5.8 GPM, minimum activation 1 GPM
MRCOOL MHWH199NCNU
3.6/10
#21 · Official UEF 0.95, maximum 5.7 GPM, minimum activation 0.6 GPM
Rheem RTGH-S84I
3.5/10
#22 · Official UEF 0.96, maximum 4.6 GPM, minimum activation 0.4 GPM
Vesta VTP-150
3.4/10
#23 · Official UEF 0.96, maximum 4.7 GPM, minimum activation 0.5 GPM
Bosch T9800 SE 199
3.3/10
#24 · Official UEF 0.95, maximum 5.4 GPM, minimum activation 0.5 GPM
Bosch T9800 SEO 199
3.3/10
#25 · Official UEF 0.95, maximum 5.4 GPM, minimum activation 0.5 GPM
Bosch T9900 SE 199
3.3/10
#26 · Official UEF 0.95, maximum 5.4 GPM, minimum activation 0.5 GPM
Bradford White RTG-K-199N1
3.3/10
#27 · Official UEF 0.95, maximum 5.4 GPM, minimum activation 0.5 GPM
Navien NPE-210S2
3.3/10
#28 · Official UEF 0.96, maximum 5.3 GPM, minimum activation 1 GPM
A. O. Smith ATHR-199M
3.1/10
#29 · Official UEF 0.95, maximum 5.9 GPM, minimum activation 1 GPM
A. O. Smith ACTH-199M-(N,P)
2.9/10
#30 · Official UEF 0.95, maximum 5.8 GPM, minimum activation 1 GPM
Takagi T-H3-OS-N
2.9/10
#31 · Official UEF 0.95, maximum 5.8 GPM, minimum activation 1 GPM
Takagi TCT-199O-N
2.9/10
#32 · Official UEF 0.95, maximum 5.8 GPM, minimum activation 1 GPM
Midea JSG48-29PCH-NG
2.8/10
#33 · Official UEF 0.95, maximum 5.2 GPM, minimum activation 0.6 GPM
Bosch T9900 SE 160
2.2/10
#35 · Official UEF 0.95, maximum 4.6 GPM, minimum activation 0.5 GPM
Navien NPE-180S2
2.0/10
#36 · Official UEF 0.96, maximum 4.4 GPM, minimum activation 1 GPM
Midea JSG40-24PCH-NG
1.9/10
#37 · Official UEF 0.95, maximum 4.4 GPM, minimum activation 0.5 GPM
A. O. Smith ATHR-160M
1.5/10
#38 · Official UEF 0.95, maximum 4.8 GPM, minimum activation 1 GPM
Takagi T-H3J-OS-N
1.3/10
#39 · Official UEF 0.95, maximum 4.7 GPM, minimum activation 1 GPM
Navien NPE-180A2
0.7/10
#40 · Official UEF 0.95, maximum 4.3 GPM, minimum activation 1 GPM