How Many Amps Does a Heat-Pump Water Heater Use?
Heat-Pump Water Heater draws about 2.3 amps at 240 volts (550 watts running) and briefly spikes to around 5 amps at startup. Heat-Pump Water Heater runs on its own dedicated 240 V circuit: a 550 W load calls for at least a 15 A double-pole breaker (your unit's nameplate may require more).
Amps = watts ÷ volts. Enter the wattage from your appliance's nameplate or label for an exact figure.
Current draw: a heat-pump water heater
2.3 A
- At 240 V
- 550 W
- Typical breaker
- 15 A
Breaker figure is guidance for a simple resistive load, sized at 125% for continuous running; confirm against the nameplate and a licensed electrician.
Heat-Pump Water Heater amperage at 120 V and 240 V
Same 550 W load: the current halves when the voltage doubles. Heat-Pump Water Heater is typically a 240 V appliance in US homes.
| Draw | Watts | Amps at 120 V | Amps at 240 V |
|---|---|---|---|
| Running | 550 W | 4.6 A | 2.3 A |
| Starting (surge) | 1,200 W | 10 A | 5 A |
The startup surge lasts a fraction of a second; it matters for generator sizing and breaker trip curves, not for your electric bill.
Breaker and circuit for a heat-pump water heater
Heat-Pump Water Heater runs on its own dedicated 240 V circuit: a 550 W load calls for at least a 15 A double-pole breaker (your unit's nameplate may require more). For a dedicated circuit, guidance is a 15 A breaker with 14 AWG copper (75°C terminations), sized at 125% of the running current because it runs 3+ hours at a time (NEC 210.20).
Guidance only: actual circuit sizing depends on your unit's nameplate, wire run length, and local code. Confirm with a licensed electrician. See the wire & breaker size chart for the full NEC ampacity table.
Measure what a heat-pump water heater actually draws
The figures above are typical ratings, and this load is usually hardwired or on a 240 V circuit, so a plug-in meter can't reach it. A clamp meter reads the current on one conductor at the disconnect or panel without breaking the circuit; opening a panel is work for someone qualified, and the voltage pen confirms a circuit is dead first.
We earn a commission if you buy through links on this page, at no extra cost to you. It does not change what we recommend. See our affiliate disclosure. As an Amazon Associate I earn from qualifying purchases.
Clamp meter
Fluke 323
Best for: Measuring what a hardwired circuit actually draws, even in a crowded panel
Non-contact voltage tester
Klein Tools NCVT-3P
Best for: Confirming a circuit is dead before you open a device or box
Frequently asked questions
Ask AI about this
Open an AI assistant with a question grounded in this page.
Amp draw of other appliances
Cite or link to this pageAPA · MLA · Chicago · HTML
Free to cite, quote and link. Copy a ready-made citation: the link back is all we ask.
- APA
WattSimple. (2026, July 16). How Many Amps Does a Heat-Pump Water Heater Use? https://wattsimple.com/how-many-amps/heat-pump-water-heater
- MLA
"How Many Amps Does a Heat-Pump Water Heater Use?" WattSimple, 16 July 2026, https://wattsimple.com/how-many-amps/heat-pump-water-heater.
- Chicago
WattSimple. "How Many Amps Does a Heat-Pump Water Heater Use?" Last modified July 16, 2026. https://wattsimple.com/how-many-amps/heat-pump-water-heater.
- HTML link
<a href="https://wattsimple.com/how-many-amps/heat-pump-water-heater">How Many Amps Does a Heat-Pump Water Heater Use?</a> (WattSimple)