Question about Water Heaters
Electric water heater has two 4500w elements. Fuse box has 3 wires (white/black/red) with a 25A old-style glass fuse for each. Every few years (yes, years, no more often than that) one of the fuses blows for no obvious reason. One time it was the red wire, the last 3 times it has been the black wire. Any idea why this is happening? Bottom line: I don't know what size fuses to use. I calculated A (amps) = W (wattage) divided by V (volts): A = 9000 / 120 = 75A, split equally among 3 fuses at 25A each. Is that how it works? Should I be using 30A fuses? Should I be using 240V in the calculation instead of 120V? Is it a bad idea to use one 30A fuse and two 25A fuses, if I don't have 3 of each? Thank you.
Your residential water heater is not 9000 watts. Or it would blow the fuse every day and melt the wire. Instead, you have dual-element non-simultaneous 4500 watt water heater.
Look at label for 'total connected watts'
25 amp breaker or fuse and 10 gauge wire is minimum acceptable for 4500 watt water heater.
Troubleshoot blowing breaker or fuse:
Why does it blow fuse once each year?? I don't know.
Fuses and breakers trip when overheating occurs on wire.
Each fuse or breaker is rated for heat, and over time, it will get hot and then cool and then get hot again ... this action weakens fuse or breaker.
To solve problem: install 3500 watt elements (and clean sediment out of tank). Wire will run cooler, and fuse will last longer. Whole fuse box will demand less power, and run cooler, and will last longer as a result. So there is less stress on electric service panel.
3500 watt element will heat water to same temperature, but takes longer. For example: 4500 watt heats 21 gallons per hour, while 3500 watt heats 17 gallons per hour.
Posted on Apr 29, 2013
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Posted on Jan 02, 2017
Your 220v hot water heater does not need the neutral(white) wire coming in. Bare wire goes to ground -green headed screw. Black goes to black, Red goes to red. White gets teminated with a wirenut or some electrical tape.
Posted on Jan 25, 2010
SOURCE: wiring an electric water heater
Hello,You are correct! Black/blue=black & Yellow=white 220volt single phase power.There are 3 wires for 3 phase power connection NOT the case in a home.Also an "off peak"timer option would use (black) only controlling the bottom element and (blue) controlling the top element.
Posted on Apr 21, 2010
Testimonial: "thank you I finally have hot water!!!!!"
They might ask you to contact the installer. If you installed it yourself ... well that is problematic. For example if vent condensation drain was not installed correctly, the condensation can drip down into the unit causing acidic water that will shorten life of heat exchanger.
Make sure there is affordable qualified service in your area before buying tankless water heater.
Avoid wallet thickness error.
Don't forget to keep up with yearly maintenance, and tankless cannot be exposed to more than 11 grains hardness in water.
And if you need a service manual for your Rheem tankless, well that is problematic since Rheem does not have service manuals ... might try reading Bosch or Bradford white service manuals.
Posted on Jul 31, 2012
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