Hot Water Heater Amperage Draw - Web the amp rating will be listed in amps or as a numerical value followed by the letter ‘a’. Web most hot water heaters will draw a maximum of 18.8 amps when operating at 100% heating output (these are 4500w 240v heaters). For example, if the rating plate states that the water heater is 240 volts. The average electric water heater runs at 240 volts and works with a. If you don't know, you should read through the rest of this guide. We will teach you how. Web you need to know how much amperage is drawn by your water heater.
The average electric water heater runs at 240 volts and works with a. We will teach you how. Web most hot water heaters will draw a maximum of 18.8 amps when operating at 100% heating output (these are 4500w 240v heaters). Web you need to know how much amperage is drawn by your water heater. Web the amp rating will be listed in amps or as a numerical value followed by the letter ‘a’. For example, if the rating plate states that the water heater is 240 volts. If you don't know, you should read through the rest of this guide.