Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40)
Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) is a heat pump (hybrid electric) water heater from Ariston with a 37 gallon rated tank and a 66 gallon first-hour rating at a 3.58 UEF — 907 kWh/yr certified use, 37.6 in tall.
Also sold as the AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-40). This model is the same certified
hardware as the AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-40), published under a
different brand — full details, comparisons, and pricing live on that page. The
certified figures below are identical.
Efficiency
Uniform Energy Factor (UEF)
3.58
Annual electricity use
907 kWh/yr
Recovery efficiency
402 %
General
Fuel
Electric
Capacity
First-hour rating
66 gal
Rated storage volume
37 gal
Draw pattern
Medium
Heat pump
Heat pump type
240 Volt Integrated HPWH
Refrigerant (GWP)
R-134a (GWP:1430)
Compressor low-temp cutoff
35 °F
Installation
Input voltage
240
Max current draw
21 A
Smart features
Smart / connected capable
Yes
Dimensions
Height
37.6 in
Diameter
18.2 in
Certification
ENERGY STAR certified
Yes
Who is the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) for?
Its 66 gallon first-hour rating suits a
household of 3–4 people under DOE sizing guidance.
Estimated running cost: about $154/year at the national
average electricity rate (907 kWh/yr certified use).
Needs a 240 V circuit; at 21 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
The heat pump compressor operates down to 35 °F ambient — below that, backup
elements take over.
Is the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) ENERGY STAR certified?
Yes, the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.58).
How much does the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) cost to run per year?
About $154 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What electrical circuit does the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) need?
The Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) runs on a 240 V circuit drawing up to 21 A; per the NEC 125% continuous-load rule plan for at least a 30 A breaker (check the installation manual for the required circuit).
Is the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) a smart water heater?
Yes, the Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) is connected-capable, with app control and eligibility for most utility demand-response programs.
