Lochinvar water heaters

134 basic models and 332 listed models.

Lochinvar 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
ACTH-199M-(N,P) 1**	Gas tankless	—	0.95	5.8	—	97%	LCTH-199M-(N,P) 1**
ATHR-160M 1**	Gas tankless	—	0.95	4.8	—	98%	LTHR-160M 1, LTHR-160X3 1
ATHR-180M 1**	Gas tankless	—	0.95	5.3	—	97%	LTHR-180M 1, LTHR-180X3 1
ATHR-199M 1**	Gas tankless	—	0.95	5.9	—	98%	LTHR-199M 1, LTHR-199X3 1
ATI-140B-N 1**	Gas tankless	—	0.81	3.6	—	84%	LTI-140B-N, LTI-140X3-N
ATI-180B-N 1**	Gas tankless	—	0.82	4.7	—	84%	LTI-180B-N 1, LTI-180X3-N 1
ATI-199B-N 1**	Gas tankless	—	0.82	5.2	—	85%	LTI-199B-N 1, LTI-199X3-N 1
ATM-140M-N 1**	Gas tankless	—	0.95	4.1	—	97%	LTM-140M-N 1, LTM-140X3-N 1
ATM-160M-N 1**	Gas tankless	—	0.95	4.8	—	96%	LTM-160M-N 1*, LTM-160M-P 11, LTM-160X3-N 1*, LTM-160X3-P 11
ATM-180M-N 1**	Gas tankless	—	0.95	5.4	—	96%	LTM-180M-N 1*, LTM-180M-P 11, LTM-180X3-N 1*, LTM-180X3-P 11
ATM-199M-N 1**	Gas tankless	—	0.95	6.0	—	96%	LTM-199M-N 1*, LTM-199M-P 11, LTM-199X3-N 1*, LTM-199X3-P 11
ATO-140B-N 1**	Gas tankless	—	0.81	3.6	—	84%	LTO-140B-N, LTO-140X3-N
ATO-180B-N 1**	Gas tankless	—	0.82	4.7	—	86%	LTO-180B-N 1, LTO-180X3-N 1
ATO-199B-N 1**	Gas tankless	—	0.82	5.0	—	86%	LTO-199B-N 1, LTO-199X3-N 1
EELBU-50 1**	Electric storage	44	0.92	—	55	98%	DRS 50B 1**
EETU-55W 1**	Electric storage	55	0.92	—	64	98%	DRT-55W 1**
ENJ-30 1**	Electric storage	26	0.91	—	43	98%	JER-30 1**
ENJ-40 1**	Electric storage	35	0.93	—	54	98%	JER-40 1**
ENJ-40W 1**	Electric storage	35	0.91	—	38	98%	JER-40W 1**
ENJB-30 1**	Electric storage	26	0.90	—	47	98%	JER-30B 1**
ENJB-40 1**	Electric storage	35	0.94	—	57	98%	JER-40B 1**
ENJB-40W 1**	Electric storage	35	0.91	—	38	98%	JER-40BW 1**
ENL-30 1**	Electric storage	26	0.90	—	44	98%	LES-30 1**
ENL-36 2**	Electric storage	33	0.92	—	51	98%	LDS-30 2, LES-36 2
ENL-40 1**	Electric storage	35	0.89	—	50	98%	LES-40 1**
ENL-50 1**	Electric storage	48	0.92	—	51	98%	LDS-50 1, LES-50 1
ENLB-40 1**	Electric storage	35	0.92	—	51	98%	LDS-40 1, LES-40B 1
ENLB-40W 1**	Electric storage	35	0.90	—	38	98%	LES-40BW 1**
ENLB-50 1**	Electric storage	44	0.93	—	60	98%	LES-50B 1**
ENLB-50W 1**	Electric storage	44	0.91	—	40	98%	LES-50BW 1**
ENS-30 1**	Electric storage	27	0.89	—	47	98%	LEM-30 1**
ENS-40 1**	Electric storage	37	0.92	—	55	98%	LDT-30 1, LEM-40 1, LEM-40-8 1**
ENS-40W 1**	Electric storage	37	0.88	—	41	98%	LEM-40W 1**
ENS-50 1**	Electric storage	46	0.92	—	57	98%	LEM-50 1, LEM-50-8 1
ENSB-30 1**	Electric storage	27	0.91	—	50	98%	LEM-30B 1**
ENT-40 1**	Electric storage	36	0.92	—	53	98%	LET-40 1, LET-40-8 1
ENT-50-1**	Electric storage	46	0.92	—	62	98%	LDT-40 1, LET-50 1, LET-50-8 1**
ENT-55 1**	Electric storage	55	0.93	—	72	98%	LDT-50 1, LET-55 1, LET-55-8 1**
FMDV-30 2**	Gas storage	29	0.61	—	60	78%	MGN03030 2**
FMDV-40 2**	Gas storage	38	0.59	—	57	76%	MGN04030 2**
FMDV-50 2**	Gas storage	47	0.57	—	67	77%	MGN05040 2**
FMHR-30 4**	Gas storage	29	0.60	—	63	79%	MFN030 35 4**
FMHR-40 4**	Gas storage	38	0.58	—	59	78%	MFN04035 4**
G6-US4040NV 5**	Gas storage	38	0.64	—	83	75%	USN04040 5, USN04040-8 5, USN04040-8T 5, USN04040-T 5
G6-UT3030NVR 5**	Gas storage	29	0.60	—	67	76%	UTN03030R 5**
G9-UT4040NVR 5**	Gas storage	38	0.64	—	83	77%	UTN04040-8R 5, UTN04040-8RT 5, UTN04040R 5**
G9-UT5040NVR 5**	Gas storage	48	0.64	—	78	77%	UTN05040-8R 5, UTN05040-8RT 5, UTN05040R 5**
GCB-30R 4**	Gas storage	29	0.60	—	62	74%	GTL03032BR 41, GTN03032BR 4*
GCB-40 4**	Gas storage	38	0.64	—	78	77%	GTL04040B 41, GTN04040B 4, GTN04040BT 4, GTN04040BTM 4*
GCBL-30R 4**	Gas storage	29	0.60	—	65	75%	GSL03032BR 41, GSN03032BR 4, GSN03032BRTM 4*
GCBL-40 4**	Gas storage	38	0.57	—	68	75%	GSL04040B 41, GSN04040B 4, GSN04040BT 4, GSN04040BTM 4*
GCF-40 1**	Gas storage	38	0.64	—	70	73%	LTL04040ES 11, LTN04040ES 1*
GCF-50 1**	Gas storage	48	0.69	—	84	80%	LTL05040ES 11, LTN05040ES 1*
GCFL-40 1**	Gas storage	38	0.66	—	65	77%	LSL04040ES 11, LSN04040ES 1*
GCG-50 4**	Gas storage	48	0.62	—	81	79%	GTL05040 41, GTL05040-8 41, GTL05040M 41, GTL05040ST 41, GTL05040TM 41, GTL05040Z 41, GTN05040 4, GTN05040 TM 4, GTN05040-10T 4, GTN05040-8 4, GTN05040-8T 4, GTN05040M 4, GTN05040ST 4, GTN05040T 4, GTN05040Z 4**
GCGH-50 2**	Gas storage	48	0.63	—	76	77%	GTN05038WR 2**
GCR-30 2**	Gas storage	29	0.63	—	63	77%	GTN03035MWR 2, GTN03035WR 2
GCR-30R 2**	Gas storage	29	0.61	—	52	74%	GTN03030WR 2**
GCR-30R 4**	Gas storage	29	0.60	—	62	73%	GTL03032R 41, GTL03032TM 4, GTN03032R 4, GTN03032RZ 4*
GCR-40 2**	Gas storage	38	0.64	—	80	74%	GTN04040MTWR 2, GTN04040MWR 2, GTN04040TWRZ 2, GTN04040WR 2, GTN04040WRZ 2**
GCR-40 410	Gas storage	38	0.64	—	80	78%	GTL04040 411, GTL04040 ST 411, GTL04040-8 411, GTL04040Z 411, GTN04040 410, GTN04040 ST 410, GTN04040 TM 410, GTN04040-10T 410, GTN04040-8 410, GTN04040-8T 410, GTN04040M 410, GTN04040T 410, GTN04040Z 410
GCR-50 2**	Gas storage	48	0.64	—	81	80%	GTN05040MTWR 2, GTN05040MWR 2, GTN05040TWRZ 2, GTN05040WR 2, GTN05040WRZ 2**
GCRH-40 4**	Gas storage	38	0.59	—	65	80%	GTN04035 4**
GCRL-30R 4**	Gas storage	29	0.60	—	55	75%	GSL03032R 41, GSN03032R 4*
GCRL-40 2**	Gas storage	38	0.58	—	64	74%	GSN04040MWR 2, GSN04040WR 2
GCRL-40 4**	Gas storage	38	0.58	—	67	78%	GSL04040 41, GSL04040-8 41, GSL04040Z 41, GSN04040 4, GSN04040-8 4, GSN04040T 4, GSN04040TM 4, GSN04040Z 4*
GCRL-50 2**	Gas storage	49	0.62	—	78	73%	GSN05040MWR 2, GSN05040WR 2
GCRL-50 4**	Gas storage	50	0.62	—	81	77%	GSL05040 41, GSL05040-8 41, GSN05040 4, GSN05040-8 4, GSN05040T 4, GSN05040TM 4, GSN05040Z 4**
GCRT-50 4**	Gas storage	48	0.61	—	89	77%	GTL05050 41, GTL05050 ST 41, GTL05050-8 41, GTL05050-8ST 41, GTN05050 4, GTN05050 ST 4, GTN05050 T 4, GTN05050 Z 4, GTN05050-8 4, GTN05050-8ST 4, GTN05050-8T 4, GTN05050M 4
GCRX-50 2**	Gas storage	49	0.61	—	99	75%	GTL05060B 21, GTL05060BST 21, GTN05060B 2, GTN05060BST 2, GTN05060BZ 2**
GCRX-55 2**	Gas storage	55	0.62	—	83	74%	CGL055060 21, CGL055060M 21, CGN055060 2, CGN055060M 2, GTL05560 21, GTL05560-8ST 21, GTL05560ST 21, GTN05560 2, GTN05560-8 2, GTN05560-8ST 2, GTN05560-8T 2, GTN05560ST 2, GTN05560Z 2*
GDV-40 3**	Gas storage	39	0.60	—	64	75%	GBL04040 31, GBL04040ST 31, GBN04040 3, GBN04040ST 3
GDV-50 3**	Gas storage	48	0.66	—	77	79%	GBL05040 31, GBL05040ST 31, GBN05040 3**
GDVT-50 3**	Gas storage	48	0.65	—	82	79%	GBL05050 31, GBL05050ST 31, GBN05050 3, GBN05050ST 3
GPCT-40L 1**	Gas storage	38	0.90	—	86	91%	LHPCT-40L 1**
GPCX-50L 1**	Gas storage	49	0.90	—	118	92%	LHPCX-50L 1**
GPDL-40 3**	Gas storage	38	0.68	—	74	79%	PRL04040ES 31, PRL04040ESST 31, PRN04040ES 3, PRN04040ESST 3
GPDNL-40 1**	Gas storage	38	0.70	—	75	77%	UPDN04040 1**
GPDNT-50 1**	Gas storage	48	0.70	—	75	79%	UPDN05040Z 1**
GPDT-50 3**	Gas storage	48	0.72	—	79	79%	PRL05045ES 31, PRL05045ESST 31, PRN05045ES 3, PRN05045ESST 3
GPDX-50L 3**	Gas storage	48	0.73	—	118	82%	PRL05065ESST 31, PRN05065ESST 3*
GPVL-40 2**	Gas storage	38	0.67	—	73	79%	PVL04040 21, PVN04040 2, PVN04040Z 2*
GPVL-50 2**	Gas storage	49	0.72	—	79	80%	PVL05040 21, PVL05040Z 21, PVN05040 2, PVN05040Z 2
GPVNT-40 1**	Gas storage	38	0.73	—	91	78%	UPNV04040 1**
GPVNT-50 1**	Gas storage	48	0.72	—	85	78%	UPVN05040
GPVT-40 2**	Gas storage	38	0.70	—	87	78%	PVL04050 21, PVL04050ST 21, PVN04050 2, PVN04050ST 2
GPVT-50 2**	Gas storage	48	0.72	—	97	81%	PVL05050 21, PVL05050ST 21, PVN05050 2, PVN05050ST 2
GPVX-50L 2**	Gas storage	50	0.73	—	119	82%	PVL05065ST 21, PVN05065ST 2*
GUC-30 4**	Gas storage	29	0.59	—	62	79%	UTN03030R 4**
GUR 40 4**	Gas storage	38	0.64	—	83	77%	UTN040 40-8R(T) 4, UTN040 40R 4
GUR-50 4**	Gas storage	48	0.64	—	84	77%	UTN05040-8R 4, UTN05040-8RT 4, UTN05040R 4**
GURT-50RL 4**	Gas storage	49	0.63	—	92	77%	UTN05050-8R 4, UTN05050R 4
HESF-40 1**	Electric storage	37	0.92	—	64	98%	DRM 40 1**
HESF-50 1**	Electric storage	46	0.92	—	67	98%	DRM 50 1**
HETF-40 1**	Electric storage	36	0.93	—	63	98%	DRT 40 1**
HETF-50 1**	Electric storage	45	0.92	—	74	98%	DRT 50 1**
HETF-55 1**	Electric storage	55	0.94	—	75	98%	DRT 55 1**
HPACO-45 1+AXST-50LBTTP 1	Heat pump	48	3.55	—	72	428%	LHPCO-45 1+LXST-50LBTTP 1
HPACO-45 1+AXST-50S 1	Heat pump	46	3.52	—	70	429%	LHPCO-45 1+LXST-50S 1, LHPCO-45 1+LXST-50STTP 1
HPACO-45 1+AXST-50T 1	Heat pump	45	3.52	—	67	413%	LHPCO-45 1+LXST-50T 1, LHPCO-45 1+LXST-50TTTP 1
HPACO-45 1+AXST-66 1	Heat pump	60	3.70	—	82	435%	LHPCO-45 1+LXST-66 1, LHPCO-45 1+LXST-66TTP 1
HPACO-45 1+AXST-80 1	Heat pump	73	3.80	—	95	423%	LHPCO-45 1+LXST-80 1, LHPCO-45 1+LXST-80TTP 1
HPTA-40 2**	Heat pump	36	3.60	—	55	426%	CHPA-40 2, HPPA040KD 2
HPTA-50 2**	Heat pump	46	3.68	—	65	416%	CHPA-50 2, HPPA050KD 2
HPTA-66 2**	Heat pump	68	3.84	—	83	435%	CHPA-66 2, HPPA065KD 2
HPTA-80 2**	Heat pump	81	3.88	—	95	428%	CHPA-80 2, HPPA080KD 2
HPTS-50 2**	Heat pump	46	3.80	—	65	452%	HPSA050KD 2**
HPTS-66 2**	Heat pump	67	3.70	—	82	425%	HPSA065KD 2**
HPTS-80 2**	Heat pump	82	3.88	—	95	430%	HPSA080KD 2**
HPTU-50N 1**	Heat pump	46	3.45	—	66	407%	HPA052KD 1**
HPTU-66N 1**	Heat pump	67	3.45	—	79	265%	HPA068KD 1**
HPTU-80N 1**	Heat pump	82	3.45	—	86	233%	HPA082KD 1**
HPTV-50 2**	Heat pump	46	3.00	—	52	457%	HPV050KD 2**
HPTV-66 2**	Heat pump	68	3.20	—	76	368%	HPV065KD 2**
HPTV-80 2**	Heat pump	82	3.00	—	93	373%	HPV080KD 2**
PG10 34 100 2V 2*	Gas storage	33	0.90	—	170	95%	SWL100-035 2, SWN100-035 2
T-H3-DV-N 1**	Gas tankless	—	0.93	5.8	—	96%	LCT-199I-N 1*, LCT-199I-P 11, LTI-540H-N 1*, LTI-540H-P 11, LTI-540HX3-N 1*, LTI-540HX3-P 11, LTI-540P-N 1*, LTI-540P-P 11
T-H3-OS-N 1**	Gas tankless	—	0.95	5.8	—	96%	LCT-199O-N 1*, LCT-199O-P 11, LTO-540H-N 1*, LTO-540H-P 11, LTO-540HX3-N 1*, LTO-540HX3-P 11, LTO-540P-N 1*, LTO-540P-P 11
T-H3J-DV-N 1**	Gas tankless	—	0.94	4.7	—	97%	LTI-240H-N 1*, LTI-240H-P 11, LTI-240X3-N 1*, LTI-240X3-P 11
T-H3J-OS-N 1**	Gas tankless	—	0.95	4.7	—	96%	LTO-240H-N 1*, LTO-240H-P 11, LTO-240X3-N 1*, LTO-240X3-P 11
T-H3M-DV-N 1**	Gas tankless	—	0.90	3.3	—	94%	LTI-140H-N 1*, LTI-140H-P 11
T-H3M-OS-N 1**	Gas tankless	—	0.91	3.5	—	96%	LTO-140H-N 1*, LTO-140H-P 11
T-H3S-DV-N 1**	Gas tankless	—	0.95	5.4	—	97%	LTI-340H-N 1*, LTI-340H-P 11, LTI-340X3-N 1*, LTI-340X3-P 11
T-H3S-OS-N 1**	Gas tankless	—	0.94	5.3	—	97%	LTO-340H-N 1*, LTO-340H-P 11, LTO-340X3-N 1*, LTO-340X3-P 11
TK-110U-E 2**	Gas tankless	—	0.81	3.5	—	83%	LTO-110U 2**
TK-110U-I 2**	Gas tankless	—	0.81	3.5	—	85%	LTI-110U 2**
TK-310C-NI 1**	Gas tankless	—	0.81	4.6	—	85%	LTI-310C 1**
TK-310CX3 1**	Gas tankless	—	0.81	4.7	—	83%	LTI-310CX3 1**
TK-310U-E 2**	Gas tankless	—	0.81	4.8	—	86%	LTO-310U 2**
TK-310U-I 2**	Gas tankless	—	0.81	4.7	—	84%	LTI-310U 2**
TK-510C-NI 1**	Gas tankless	—	0.81	4.7	—	82%	LTI-510C 1**
TK-510CX3 1**	Gas tankless	—	0.81	5.0	—	83%	LTI-510CX3 1**
TK-510U-E 2**	Gas tankless	—	0.81	5.0	—	84%	LTO-510U 2**
TK-510U-I 2**	Gas tankless	—	0.81	5.0	—	84%	LTI-510U 2**

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. This UEF belongs to a heat pump, which moves heat from the air. The highest UEF is shared by 2 basic models, among them the HPTA-80 2**. This brand has an ENERGY STAR certified model number in 31 of its 134 basic models.

Its basic models are gas storage, gas tankless, electric storage, and heat pump water heaters. This brand's highest first-hour rating is 170 gallons, on the PG10 34 100 2*V 2**. Those 170 gallons include water the tank heats while the hour runs. Its tankless models reach their highest flow on the ATM-199M-N 1**. In the test, that flow warms by 67°F at 6.0 gallons per minute.

Among the 117 brands on this site, 4 list more model numbers than Lochinvar. At least one of its basic model numbers appears under each of 12 other brands. The largest overlap is with A. O. Smith, at 134 basic model numbers.

Basic models shared with other brands

Lochinvar basic models also listed under another brand
Brand	Shared basic models
A. O. Smith	134
State	133
American	130
RELIANCE WATER HEATERS	114
U.S. Craftmaster	28
John Wood	23
GSW WATER HEATERS	21
Takagi	18
Giant	4
Envirosense	2
Envirosense Enercare	2
Envirosense Reliance Home Comfort	2

Updated Oct 26, 2026 · Methodology

Lochinvar water heaters

Certified figures by basic model

Basic models shared with other brands