Single Phase
A look at what is currently available on eBay
 AC250V 50/60Hz Single Phase Noise AC Power Line Filters US $11.53 
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 75A Single Phase Solid State Relay w Aluminum Heat Sink US $21.46
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 50A Single Phase Solid State Relay w Aluminum Heat Sink US $20.89
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 Bridge Rectifier Single Phase Diode 50A Amp 1000V Volt KBPC5010 US $3.40
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 AC 24-380V Output Single Phase Solid State Relay 40A US $17.04
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 Single Phase Machine 25uF AC Motor Starting Capacitor US $10.18
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what is the difference between single phase and three phase wiring?
My heat pump emergency heater is rated 10.0/7.7kW 240/208 volts, is this three phase or single phase?
Your heat pump emergency heater is a single phase unit which will operate on either 240 volts or 208 volts. The 10.7/7.7 kw indicates the wattage output at 240 volts and 208 volts respectively.
The resistance of the heater is 10700/240 or 44.58333 ohms.
An electrical heater element will operate on any voltage, but the wattage will be reduced significantly from the 10.7 Kw.
You very seldom see a three phase heater element outside of a few industrial plants
texmav
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