RELIANCE WATER HEATERS water heaters

156 basic models and 289 listed models.

RELIANCE WATER HEATERS basic models and their certified figures
Basic model	Type	Storage volume (gal)	UEF	Flow at a 67°F rise (gal/min)	First-hour rating (gal)	Recovery efficiency	Model numbers
6-30-EMHBS 1**	Electric storage	27	0.90	—	49	98%	6-30-EMHBS 1**
6-40-RPCS 1*	Gas storage	38	0.90	—	86	91%	6-40-RPCS 1*
6-50-TPDT 3*	Gas storage	49	0.88	—	100	95%	6-50-TPDT 3*
6-50-XPCS 1*	Gas storage	49	0.90	—	118	92%	6-50-XPCS 1*
6-50-YTVIT 1**	Gas storage	48	0.88	—	119	93%	6-50-YTVIT 1**
8-50-TPDT 4*	Gas storage	49	0.88	—	118	97%	8-50-TPDT 4*
ATHR-160M 1**	Gas tankless	—	0.95	4.8	—	98%	RTHR-160M 1, RTHR-160X3 1
ATHR-180M 1**	Gas tankless	—	0.95	5.3	—	97%	RTHR-180M 1, RTHR-180X3 1
ATHR-199M 1**	Gas tankless	—	0.95	5.9	—	98%	RTHR-199M 1, RTHR-199X3 1
ATI-140B-N 1**	Gas tankless	—	0.81	3.6	—	84%	RTI-140B-N, RTI-140X3-N
ATI-180B-N 1**	Gas tankless	—	0.82	4.7	—	84%	RTI-180B-N 1, RTI-180X3-N 1
ATI-199B-N 1**	Gas tankless	—	0.82	5.2	—	85%	RTI-199B-N 1, RTI-199X3-N 1
ATM-140M-N 1**	Gas tankless	—	0.95	4.1	—	97%	RTM-140M-N 1, RTM-140X3-N 1
ATM-160M-N 1**	Gas tankless	—	0.95	4.8	—	96%	RTM-160M-N 1*, RTM-160M-P 11, RTM-160X3-N 1*, RTM-160X3-P 11
ATM-180M-N 1**	Gas tankless	—	0.95	5.4	—	96%	RTM-180M-N 1*, RTM-180M-P 11, RTM-180X3-N 1*, RTM-180X3-P 11
ATM-199M-N 1**	Gas tankless	—	0.95	6.0	—	96%	RTM-199M-N 1*, RTM-199M-P 11, RTM-199X3-N 1*, RTM-199X3-P 11
ATO-140B-N 1**	Gas tankless	—	0.81	3.6	—	84%	RTO-140B-N, RTO-140X3-N
ATO-180B-N 1**	Gas tankless	—	0.82	4.7	—	86%	RTO-180B-N 1, RTO-180X3-N 1
ATO-199B-N 1**	Gas tankless	—	0.82	5.0	—	86%	RTO-199B-N 1, RTO-199X3-N 1
E62-38T-045DV 1**	Tabletop	35	0.90	—	55	98%	6-38EOTT 1**
EELBU-50 1**	Electric storage	44	0.92	—	55	98%	6-50-DURLB 1**
EETU-55W 1**	Electric storage	55	0.92	—	64	98%	6-55-DURTW 1**
ENJ-30 1**	Electric storage	26	0.91	—	43	98%	6-30-EOMS 1**
ENJ-40 1**	Electric storage	35	0.93	—	54	98%	6-40-EOMS 1**
ENJB-30 1**	Electric storage	26	0.90	—	47	98%	6-30-DHLE 1, 6-30-EOMBD 1, 6-30-EOMBS 1, 6-30-SHLK 1
ENJB-40 1**	Electric storage	35	0.94	—	57	98%	6-40-EOMBS-E 1**
ENL-30 1**	Electric storage	26	0.90	—	44	98%	6-30-EOLS 1**
ENL-36 2**	Electric storage	33	0.92	—	51	98%	6-36-EOLS 2**
ENL-40 1**	Electric storage	35	0.89	—	50	98%	6-40-EOLS 1**
ENL-50 1**	Electric storage	48	0.92	—	51	98%	6-50-EOLS 1**
ENLB-30 1**	Electric storage	26	0.89	—	43	98%	6-30-EOLBS 1**
ENLB-40 1**	Electric storage	35	0.92	—	51	98%	6-40-EOLBS 1**
ENLB-50 1**	Electric storage	44	0.93	—	60	98%	6-50-EOLBS 1**
ENS-30 1**	Electric storage	27	0.89	—	47	98%	6-30-EORS 1**
ENS-40 1**	Electric storage	37	0.92	—	55	98%	6-40-EOHRS 1, 6-40-EORS 1, 9-40-EORS 1**
ENS-50 1**	Electric storage	46	0.92	—	57	98%	6-50-EOHRS 1, 6-50-EORS 1, 9-50-EORS 1**
ENSB-30 1**	Electric storage	27	0.91	—	50	98%	6-30-EORBS 1**
ENT-40 1**	Electric storage	36	0.92	—	53	98%	6-40-EOHRT 1, 6-40-EORT 1, 9-40-EORT 1**
ENT-50-1**	Electric storage	46	0.92	—	62	98%	6-50-EORT 1, 9-50-EORT 1
ENT-55 1**	Electric storage	55	0.93	—	72	98%	6-55-EORT 1**
FMDV-30 2**	Gas storage	29	0.61	—	60	78%	6-30-MDV 2**
FMDV-40 2**	Gas storage	38	0.59	—	57	76%	6-40-MDV 2**
FMDV-50 2**	Gas storage	47	0.57	—	67	77%	6-50-MDV 2**
FMHR-30 4**	Gas storage	29	0.60	—	63	79%	6 30 NOMT 4**
FMHR-40 4**	Gas storage	38	0.58	—	59	78%	6-40-NOMT 4**
FPTU-50 1**	Heat pump	46	3.35	—	66	407%	6-50-DHPHT 1**
FPTU-66 1**	Heat pump	67	3.42	—	79	265%	6-66-DHPHT 1**
FPTU-80 1**	Heat pump	82	3.45	—	84	233%	6-80-DHPHT 1**
G6-US4040NV 5**	Gas storage	38	0.64	—	83	75%	6-40-UNBCS 5**
G6-UT3030NVR 5**	Gas storage	29	0.60	—	67	76%	6-30-UNOTR 5**
G6N-UT4040NVR 5**	Gas storage	38	0.64	—	83	74%	6-40-UNBRT 5, 9-40-UNKRT 5
G6N-UT5040NVR 5**	Gas storage	48	0.63	—	76	77%	6-50-UNBRT 5, 9-50-UNKRT 5
G9-UT4040NVR 5**	Gas storage	38	0.64	—	83	77%	12-40-UNACT 5, 6-40-UNBCT 5, 9-40-UNKCT 5**
G9-UT5040NVR 5**	Gas storage	48	0.64	—	78	77%	12-50-UNACT 5, 6-50-UNBCT 5, 9-50-UNKCT 5**
GCB-30R 4**	Gas storage	29	0.60	—	62	74%	6-30-NORBTR 4*, 6-30-PORBTR 41
GCB-40 4**	Gas storage	38	0.64	—	78	77%	6-40-NBRBT 4*, 6-40-PBRBT 41
GCBL-30R 4**	Gas storage	29	0.60	—	65	75%	6-30-NORBSR 4*, 6-30-PORBSR 41
GCBL-40 4**	Gas storage	38	0.57	—	68	75%	6-40-NBRBS 4*, 6-40-PBRBS 41
GCF-40 1**	Gas storage	38	0.64	—	70	73%	6-40-GBFT 1*, 6-40-LBFT 11, 9-40-GKFT 1*, 9-40-LKFT 11
GCF-50 1**	Gas storage	48	0.69	—	84	80%	6-50-GBFT 1*, 6-50-LBFT 11, 9-50-GKFT 1*, 9-50-LKFT 11
GCFL-40 1**	Gas storage	38	0.66	—	65	77%	6-40-GBFS 1*, 6-40-LBFS 11, 9-40-GKFS 1*, 9-40-LKFS 11
GCFL-50 1**	Gas storage	49	0.69	—	78	79%	6-50-GBFS 1, 9-50-GKFS 1
GCG-50 4**	Gas storage	48	0.62	—	81	79%	6-50-NBRT 4*, 6-50-PBRT 41, 9-50-NBRT 4, 9-50-NKRT 4, 9-50-PKRT 4*1
GCR-30R 4**	Gas storage	29	0.60	—	62	73%	6-30-NOCTR 4*, 6-30-POCTR 41
GCR-40 410	Gas storage	38	0.64	—	80	78%	12-40-NACT 410, 12-40-PACT 411, 6-40-NBCT 410, 6-40-POCT 411, 9-40-NBCT 410, 9-40-NKCT 410, 9-40-PKCT 411
GCR-50 2**	Gas storage	48	0.64	—	81	80%	6-50-NBRT 2**
GCR-50 4**	Gas storage	48	0.62	—	84	77%	12-50-NACT 4*, 12-50-PACT 41
GCRH-40 4**	Gas storage	38	0.59	—	65	80%	3-40-NOCT 4, 6-40-NOCT 4
GCRL-30R 4**	Gas storage	29	0.60	—	55	75%	6-30-NOCSR 4*, 6-30-POCSR 41, GS6-30-OCSR 4*1
GCRL-40 4**	Gas storage	38	0.58	—	67	78%	12-40-NACS 4, 6-40-NBCS 4, 6-40-PBCS 41, 9-40-NBCS 4, 9-40-NKCS 4, 9-40-PKCS 41
GCRL-50 4**	Gas storage	50	0.62	—	81	77%	6-50-NBCS 4, 9-50-NBCS 4
GCRT-50 4**	Gas storage	48	0.61	—	89	77%	12-50-NQCT 4**
GCRX-55 2**	Gas storage	55	0.62	—	83	74%	6-55-HXCT 21, 6-55-HXCTL 21, 6-55-YXCT 2, 6-55-YXCTL 2
GDHE-75 3**	Gas storage	74	0.86	—	130	96%	6-75- TPDT 3*
GDV-40 3**	Gas storage	39	0.60	—	64	75%	6-40-HBDS 31, 6-40-YBDS 3*
GDV-50 3**	Gas storage	48	0.66	—	77	79%	6-50-HBDS 31, 6-50-YBDS 3*
GDVNL-40L 1**	Gas storage	38	0.61	—	64	74%	6-40-UODSL 1**
GDVNT-50L 1**	Gas storage	48	0.65	—	84	81%	6-50-UODTL 1**
GPCT-40L 1**	Gas storage	38	0.90	—	86	91%	9-40-HRPCS 1, 9-40-YRPCS 1
GPCX-50L 1**	Gas storage	49	0.90	—	118	92%	9-50-HXPCS 1, 9-50-YXPCS 1
GPDL-40 3**	Gas storage	38	0.68	—	74	79%	6 40HBPDS 31, 6-40-YBPDS 3*
GPDT-50 3**	Gas storage	48	0.72	—	79	79%	6-50-HBPDT 31, 6-50-YBPDT 3*
GPVL-40 2**	Gas storage	38	0.67	—	73	79%	6-40-HBVIS 21, 6-40-YBVIS 2, 9-40-HBVIS 21, 9-40-YBVIS 2**
GPVL-50 2**	Gas storage	49	0.72	—	79	80%	6-50-HBVIS 21, 6-50-YBVIS 2, 9-50-HBVIS 21, 9-50-YBVIS 2**
GPVNT-40 1**	Gas storage	38	0.73	—	91	78%	6-40-UBPVT 1**
GPVNT-50 1**	Gas storage	48	0.72	—	85	78%	6-50-UBPVT 1**
GPVT-40 2**	Gas storage	38	0.70	—	87	78%	6-40-HRVIT 21, 6-40-YRVIT 2, 9-40-HRVIT 21, 9-40-YRVIT 2**
GPVT-50 2**	Gas storage	48	0.72	—	97	81%	6-50-HRVIT 21, 6-50-YRVIT 2, 9-50-HRVIT 21, 9-50-YRVIT 2**
GUC 40 4**	Gas storage	38	0.64	—	83	74%	6-40-UNBRT 4, 9-40-UNKRT 4
GUC-30 4**	Gas storage	29	0.59	—	62	79%	6-30-UNORT 4**
GUC-50 4**	Gas storage	48	0.61	—	84	77%	6-50-UNBRT 4, 9-50-UNKRT 4
GUF-40 1**	Gas storage	38	0.65	—	68	73%	6-40-UNBFT 1**
GUF-50 1**	Gas storage	48	0.70	—	83	73%	6-50-UNBFT 1**
GUR 40 4**	Gas storage	38	0.64	—	83	77%	(6,9,12) 40 UN(A,B,K)CT* 4**
GUR-50 4**	Gas storage	48	0.64	—	84	77%	12-50-UNACT 4, 6-50-UNBCT 4, 9-50-UNKCT 4**
HDHE-75 4**	Gas storage	74	0.86	—	150	97%	8-75-TPDT 4*
HESF-40 1**	Electric storage	37	0.92	—	64	98%	12-40-DAFRS 1, 6-40-DURS 1, 9-40-DAHRS 1**
HESF-50 1**	Electric storage	46	0.92	—	67	98%	12-50-DAFRS 1, 6-50-DURS 1, 9-50-DAHRS 1, 9-50-DHRS 1
HETF-40 1**	Electric storage	36	0.93	—	63	98%	6-40-DURT 1**
HETF-50 1**	Electric storage	45	0.92	—	74	98%	12-50-DAFRT 1, 6-50-DURT 1, 9-50-DAHRT 1, 9-50-DHRT 1
HETF-55 1**	Electric storage	55	0.94	—	75	98%	6-55-DURT 1**
HPACO-45 1+AXST-50LBTTP 1	Heat pump	48	3.55	—	72	428%	RHPCO-45 1+RXST-50LBG 1
HPACO-45 1+AXST-50S 1	Heat pump	46	3.52	—	70	429%	RHPCO-45 1+RXST-50S 1, RHPCO-45 1+RXST-50SG 1
HPACO-45 1+AXST-50T 1	Heat pump	45	3.52	—	67	413%	RHPCO-45 1+RXST-50T 1, RHPCO-45 1+RXST-50TG 1
HPACO-45 1+AXST-66 1	Heat pump	60	3.70	—	82	435%	RHPCO-45 1+RXST-66 1, RHPCO-45 1+RXST-66G 1
HPACO-45 1+AXST-80 1	Heat pump	73	3.80	—	95	423%	RHPCO-45 1+RXST-80 1, RHPCO-45 1+RXST-80G 1
HPTA-40 2**	Heat pump	36	3.60	—	55	426%	10-40-DHPTA 2**
HPTA-50 2**	Heat pump	46	3.68	—	65	416%	10-50-DHPTA 2**
HPTA-66 2**	Heat pump	68	3.84	—	83	435%	10-66-DHPTA 2**
HPTA-80 2**	Heat pump	81	3.88	—	95	428%	10-80-DHPTA 2**
HPTS-50 2**	Heat pump	46	3.80	—	65	452%	10-50-DHPTS 2**
HPTS-66 2**	Heat pump	67	3.70	—	82	425%	10-66-DHPTS 2**
HPTS-80 2**	Heat pump	82	3.88	—	95	430%	10-80-DHPTS 2**
HPTU-50N 1**	Heat pump	46	3.45	—	66	407%	10-50-DHPHTCTA 1, 10-50-DHPHTNE 1
HPTU-66N 1**	Heat pump	67	3.45	—	79	265%	10-66-DHPHTCTA 1, 10-66-DHPHTNE 1
HPTU-80N 1**	Heat pump	82	3.45	—	86	233%	10-80-DHPHTCTA 1, 10-80-DHPHTNE 1
HPTV-50 2**	Heat pump	46	3.00	—	52	457%	10-50-DHPTV 2**
HPTV-66 2**	Heat pump	68	3.20	—	76	368%	10-66-DHPTV 2**
HPTV-80 2**	Heat pump	82	3.00	—	93	373%	10-80-DHPTV 2**
MHE6-40R-045D 1**	Electric storage	36	0.95	—	54	98%	6-40-EMHSDH 1, 6-40-SHMSE 1
MHE6-40RW-035D-1**	Electric storage	36	0.91	—	40	98%	6-40-DHMSE 1, 6-40-EMHSDW-1
PESX-40 1**	Electric storage	37	0.92	—	66	98%	12-40-DXRS 1**
PESX-50 1**	Electric storage	46	0.92	—	70	98%	12-50-DXRS 1**
PETX-40 1**	Electric storage	37	0.92	—	64	98%	12-40-DXRT
PETX-50 1**	Electric storage	46	0.92	—	74	98%	12-50-DXRT 1**
PETX-55 1**	Electric storage	55	0.94	—	76	98%	12-55-DXRT 1**
R2VA-140E 1**	Electric tankless	—	0.84	1.3	—	93%	R2VX-140E 1, R2VX-140X 1
R2VA-160E 1**	Electric tankless	—	0.82	1.6	—	92%	R2VX-160E 1**
R2VR-180E 1**	Electric tankless	—	0.84	1.6	—	98%	R2VX-180E 1**
R4LA-180E 1**	Electric tankless	—	0.92	1.7	—	96%	R4LX-180E 1**
R4LA-220E 1**	Electric tankless	—	0.92	2.2	—	97%	R4LX-220E 1**
R4LA-240E 1**	Electric tankless	—	0.92	2.3	—	97%	R4LX-240E 1**
R4LA-280E 1**	Electric tankless	—	0.92	2.5	—	98%	R4LX-280E 1, R4LX-280X 1
R4MA-320E 1**	Electric tankless	—	0.93	2.8	—	98%	R4MX-320E 1**
T-H3-DV-N 1**	Gas tankless	—	0.93	5.8	—	96%	TS-540-GIH 1*, TS-540-LIH 11, TS-540P-GIH 1*, TS-540P-LIH 11, TS-540X3-GIH 1*, TS-540X3-LIH 11
T-H3-OS-N 1**	Gas tankless	—	0.95	5.8	—	96%	TS-540-GEH 1*, TS-540-LEH 11, TS-540P-GEH 1*, TS-540P-LEH 11, TS-540X3-GEH 1*, TS-540X3-LEH 11
T-H3J-DV-N 1**	Gas tankless	—	0.94	4.7	—	97%	TS-240-GIH 1*, TS-240-LIH 11, TS-240X3-GIH 1*, TS-240X3-LIH 11
T-H3J-OS-N 1**	Gas tankless	—	0.95	4.7	—	96%	TS-240-GEH 1*, TS-240-LEH 11, TS-240X3-GEH 1*, TS-240X3-LEH 11
T-H3M-DV-N 1**	Gas tankless	—	0.90	3.3	—	94%	TS-140-GIH 1*, TS-140-LIH 11
T-H3M-OS-N 1**	Gas tankless	—	0.91	3.5	—	96%	TS-140-GEH 1*, TS-140-LEH 11
T-H3S-DV-N 1**	Gas tankless	—	0.95	5.4	—	97%	TS-340-GIH 1*, TS-340-LIH 11, TS-340X3-GIH 1*, TS-340X3-LIH 11
T-H3S-OS-N 1**	Gas tankless	—	0.94	5.3	—	97%	TS-340-GEH 1*, TS-340-LEH 11, TS-340X3-GEH 1*, TS-340X3-LEH 11
TK-110U-E 2**	Gas tankless	—	0.81	3.5	—	83%	TS-110U-E 2**
TK-110U-I 2**	Gas tankless	—	0.81	3.5	—	85%	TS-110U-I 2**
TK-310C-NI 1**	Gas tankless	—	0.81	4.6	—	85%	TS-310C-GI 1**
TK-310CX3 1**	Gas tankless	—	0.81	4.7	—	83%	TS-310CX3 1**
TK-310U-E 2**	Gas tankless	—	0.81	4.8	—	86%	TS-310U-E 2**
TK-310U-I 2**	Gas tankless	—	0.81	4.7	—	84%	TS-310U-I 2**
TK-510C-NI 1**	Gas tankless	—	0.81	4.7	—	82%	TS-510C-GI 1**
TK-510CX3 1**	Gas tankless	—	0.81	5.0	—	83%	TS-510CX3 1**
TK-510U-E 2**	Gas tankless	—	0.81	5.0	—	84%	TS-510U-E 2**
TK-510U-I 2**	Gas tankless	—	0.81	5.0	—	84%	TS-510U-I 2**
UPVA-110E 1**	Electric tankless	—	0.93	1.0	—	98%	UPVX-110E 1**
UPVA-30K 1**	Electric tankless	—	0.93	0.3	—	98%	UPVX-30K 1**
UPVA-55E 1**	Electric tankless	—	0.92	0.5	—	98%	UPVX-55E 1**
UPVA-90E 1**	Electric tankless	—	0.93	0.8	—	98%	UPVX-90E 1**

A range means the models under one basic model differ. A dash means the model has no such figure.

This brand's highest UEF, the energy that reaches the water for each unit used, is 3.88. That UEF is over 1 because heat pumps move heat from air into water. The HPTA-80 2** is one of 2 basic models with that UEF. Of its 156 basic models, 40 list an ENERGY STAR certified model.

Its range spans 6 kinds: gas storage, electric storage, gas tankless, heat pump, electric tankless, and tabletop. Its first-hour peak, 150 gallons, comes from the HDHE-75 4**. In the test, a full tank reheats while those 150 gallons are drawn. Without a tank, the ATM-199M-N 1** gives this brand's highest flow. The test warms the water by 67°F at 6.0 gallons per minute.

On this site, 5 of the 117 brands list more model numbers than RELIANCE WATER HEATERS's 289. At least one of its basic model numbers appears under each of 12 other brands. Of those, A. O. Smith lists the most: 150 of this brand's 156.

Basic models shared with other brands

RELIANCE WATER HEATERS basic models also listed under another brand
Brand	Shared basic models
A. O. Smith	150
State	148
American	139
Lochinvar	114
U.S. Craftmaster	30
John Wood	22
GSW WATER HEATERS	21
Takagi	18
Giant	4
Envirosense	2
Envirosense Enercare	2
Envirosense Reliance Home Comfort	2

Updated Oct 26, 2026 · Methodology

RELIANCE WATER HEATERS water heaters

Certified figures by basic model

Basic models shared with other brands