Ariston water heaters

61 basic models and 70 listed models.

Ariston 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
ARIHPWH-40	Heat pump	37	3.58	—	66	402%	ARIHPWH-40
ARIHPWH-40-T	Heat pump	37	3.55	—	65	407%	ARIHPWH-40 MAX, ARIHPWH-40-T
ARIHPWH-50	Heat pump	45	3.75	—	68	430%	ARIHPWH-50
ARIHPWH-50-T	Heat pump	45	3.83	—	69	437%	ARIHPWH-50 MAX, ARIHPWH-50-T
ARIHPWH-65	Heat pump	62	3.85	—	78	435%	ARIHPWH-65
ARIHPWH-65-T	Heat pump	61	4.05	—	77	446%	ARIHPWH-65 MAX, ARIHPWH-65-T
ARIHPWH-80	Heat pump	73	4.01	—	87	443%	ARIHPWH-80
ARIHPWH-80-T	Heat pump	74	4.10	—	88	474%	ARIHPWH-80 MAX, ARIHPWH-80-T
AURES PRO 18 240V US	Electric tankless	—	0.94	1.7	—	97%	AURES PRO 18 240V US
AURES PRO 24 240V US	Electric tankless	—	0.94	2.3	—	97%	AURES PRO 24 240V US
AURES PRO 27 240V US	Electric tankless	—	0.93	2.5	—	97%	AURES PRO 27 240V US
AURES SM 10.5 240V US*	Electric tankless	—	0.95	1.1	—	95%	AURES SM 10.5 240V US*
AURES SM 13 240V US	Electric tankless	—	0.89	1.3	—	88%	AURES SM 13 240V US
AURES SM 3 CB 110V US*	Electric tankless	—	0.94	0.4	—	94%	AURES SM 3 CB 110V US*
AURES SM 6.5 240V US*	Electric tankless	—	0.96	0.7	—	97%	AURES SM 6.5 240V US*
ELV0552****	Electric storage	55	0.94	—	77	98%	SUPR0552****
ENS30L-*	Electric storage	27	0.93	—	44	98%	ES30S-S*
ENS30LU-*	Electric storage	27	0.93	—	40	98%	ES30S*
ENS30LUB 240V-3500W	Electric storage	27	0.92	—	35	98%	ESB30S 240V-3500W*
ENS30LUB*	Electric storage	28	0.92	—	40	98%	ESB30S*
ENS30T-*	Electric storage	27	0.92	—	41	98%	ES30M, LCE30M
ENS40H-*	Electric storage	37	0.92	—	51	98%	ES40T*
ENS40H-DR***	Electric storage	36	0.92	—	58	98%	ESDR40T-*
ENS40L-*	Electric storage	36	0.92	—	46	98%	ES40S-S*
ENS40LU-*	Electric storage	36	0.91	—	41	98%	ES40S*
ENS40LUB 240V-3500W	Electric storage	36	0.92	—	39	98%	ESB40S 240V-3500W*
ENS40LUB*	Electric storage	36	0.92	—	50	98%	ESB40S*
ENS40T-*	Electric storage	36	0.92	—	51	98%	ES40M, LCE40M
ENS40T-DR***	Electric storage	36	0.93	—	54	98%	ESDR40M-*
ENS50H*	Electric storage	45	0.92	—	65	98%	ES50T*
ENS50H-DR***	Electric storage	46	0.92	—	67	98%	ESDR50T-*
ENS50L-6*	Electric storage	42	0.92	—	52	98%	ES50S-S*
ENS50LU-*	Electric storage	42	0.93	—	52	98%	ES50S*
ENS50T-*	Electric storage	45	0.92	—	60	98%	ES50M, LCE50M
ENS50T-DR***	Electric storage	46	0.92	—	61	98%	ESDR50M-*
EVR0402X**	Electric storage	39	0.94	—	56	98%	ARIER0402X**
EVR0522X**	Electric storage	48	0.93	—	62	98%	ARIER0522X**
GN30L2-3-*	Gas storage	29	0.60	—	66	75%	GSU30S35-2*
GN30T1-3-*	Gas storage	29	0.60	—	70	78%	GSU30T40-1*
GN30T2-3-*	Gas storage	29	0.60	—	67	77%	GSU30T40-2*
GN40L2-3-*	Gas storage	38	0.60	—	62	78%	GSU40S37-2*
GN40T1-3-*	Gas storage	38	0.59	—	68	74%	GSU40T40-1*
GN40T2-3-*	Gas storage	38	0.60	—	73	76%	GSU40T40-2*
GN50L2-3-*	Gas storage	48	0.65	—	78	78%	GSU50S40-2*
GN50T1-3-*	Gas storage	47	0.63	—	85	84%	GSU50T40-1*
GN50T2-3-*	Gas storage	47	0.66	—	86	80%	GSU50T40-2*
GSN30T1-3-*	Gas storage	29	0.60	—	72	77%	GS30T35-1*
GSN30T2-3-*	Gas storage	29	0.60	—	69	77%	GS30T35-2*
GSN40L2-3-*	Gas storage	38	0.60	—	64	76%	GS40S37-2*
GSN40T1-3-*	Gas storage	38	0.60	—	74	79%	GS40T40-1*
GSN40T2-3-*	Gas storage	38	0.59	—	70	76%	GS40T40-2*
GSN50L2-3-*	Gas storage	48	0.65	—	78	81%	GS50S40-2*
GSN50T1-3-*	Gas storage	47	0.65	—	86	82%	GS50T40-1*
GSN50T2-3-*	Gas storage	47	0.63	—	82	82%	GS50T40-2*
PV40SLN*	Gas storage	39	0.64	—	71	77%	GSPV40S40*
PV40TLN*	Gas storage	38	0.70	—	78	80%	GSPV40T40, GSPV40T50
PV40TLN50	Gas storage	38	0.70	—	83	80%	GSPV40T50*
PV50SLN*	Gas storage	48	0.69	—	80	80%	GSPV50S40, GSPV50S65
PV50SLN-65	Gas storage	47	0.69	—	110	82%	GSPV50S65*
PV50TLN*	Gas storage	48	0.70	—	81	79%	GSPV50T40*
PV50TLN-65	Gas storage	47	0.71	—	107	82%	GSPV50T65*

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 4.10. A heat pump reaches this UEF by taking heat from the air around it. The ARIHPWH-80-T is the one basic model of this brand with that UEF. This brand has an ENERGY STAR certified model number in 8 of its 61 basic models.

This brand lists 4 kinds: gas storage, electric storage, heat pump, and electric tankless. The PV50SLN*-65* holds this brand's highest first-hour rating: 110 gallons. Part of those 110 gallons is water warmed as the tank drains. Its tankless models reach their highest flow on the AURES PRO 27 240V US. The test warms the water by 67°F at 2.5 gallons per minute.

This brand's 70 model numbers rank it below 14 of the 117 brands on this site. At least one of its basic model numbers appears under each of 2 other brands. The largest overlap is with AMERICAN STANDARD WATER HEATERS, at 50 basic model numbers.

Basic models shared with other brands

Ariston basic models also listed under another brand
Brand	Shared basic models
AMERICAN STANDARD WATER HEATERS	50
HTP	3

Updated Oct 17, 2026 · Methodology

Ariston water heaters

Certified figures by basic model

Basic models shared with other brands