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What is dry fire |
 Energy Smart has dry fire protection Dry Fire prevention is not 100% sure. |
What
is dry fire Water heater must be full of water before electricity is turned ON. If water is not covering elements, then upper element will dry-fire ... or instantly burn out. Dry fire only happens when tank is empty of water. Some water heater elements claim to have dry fire protection. This will help prevent dry-fire incident, but not foolproof. To prevent dry fire: Fill tank completely with water, until water is coming out of bathtub spout, then open TP valve to release last of air from inside tank, and lastly, turn power ON. Test elements if you suspect dry fire is causing water heater not to work: Resources How to test elements Full troubleshoot for electric water heater How electric water heaters work |
 Camco/ no extended warranty Low Watt Density/ foldback Check minimum tank diameter Fits any tank above minimum dia Buy: 240 volt: 2500 watt 3500 watt 4500 watt 4500 watt 12 pack 5500 watt 6000 watt / 17" minimum tank/ use 8 gauge wire |
Question from Ron: Why
is upper element affected by dry fire? Answer: Upper element dry fires.. but lower element rarely does Because typical 240 volt residential water heater is non-simultaneous: This means the upper element receives power first, and only after upper part of tank is heated does it send power to lower part of tank. If upper element dry fires, then upper part of tank never gets heater, so power never arrives at lower element ... the result is the lower element does not dry fire and is still functional. Resources: How electric water heaters work How to wire thermostats How thermostats work |
 Resistored elements Have dry fire resistance Rheem/ no extended warranty Low Watt Density/ foldback Buy: 240 volt/ resistored: 4500 watt resistorized 6000 watt resistorized Resistored elements Buy: 208 volt: 2000 watt 208 volt 208 volt elements |
Question from Howard. I hear
there are elements with a fuse that will not dry fire.
Should I buy that kind? Answer: The fuse is a resistor as I understand it, and it helps prevent dry fire, but is not 100%. Of course folks buy the 'fused' or resistored elements from Rheem. Resistored element have dry fire resistance, but the problem of dry fire is not common, and happens only when tank is empty of water. |
$25 - $47 5 year warranty Ultra Low Watt Density/ ripple Hard water element Resists high mineral count Minimum 15" diameter tank Buy 240 volt: 4500 watt at Amazon 4500 watt at Amazon 13" diameter 5500 watt at Amazon Camco elements at Amazon Lifetime warranty 4500 watt +limited lifetime element Reliance / no extended warranty Low density/ ripple Min 13" tank Buy 240 Volt Reliance 4500 watt at Amazon Reliance 5500 watt ripple at Amazon Reliance elements at Amazon |
$13 - $26 5 year warranty Ultra Low Watt Density/ foldback Hard water element Resists high mineral count Check minimum tank diameter Fits any tank above minimum dia Buy 120 volt 1500 watt 120 volt 8" minimum Buy 240 volt: 2500 watt at Amazon 3500 watt at Amazon 4500 watt at Amazon 5500 watt at Amazon Warranties do not cover dry fire (electricity ON before tank is full of water). Resource: Read about dry fire/ pdf page 2 |
$10 - $16 Camco/ no extended warranty Low Watt Density/ foldback Check minimum tank diameter Fits any tank above minimum dia Buy 240 volt: 2500 watt at Amazon 3500 watt at Amazon 4500 watt at Amazon 4500 watt 12 pack 5500 watt at Amazom 6000 watt at Amazon/ 17" minimum tank (6000 watts requires 8 guage wire) Elements on this webpage are rated for AC voltages. AC elements with work with DC But Thermostats will melt with DC |
$10 - $12 Camco/ no extended warranty/ High Watt Density Standard on all new water heater Can use foldback as replacement Match volts and watts Check minimum tank diameter 120 Volt point-of-use water heater Buy 120 volt: 1000 watt 120 volt 8" tank diameter 1500 watt 120 volt 8' tank diameter 1650 watt 120 volt 7.5" minimum 1750 watt 120 volt 9" minimum 2000 watt 120 volt 9" minimum 120 Volt elements at Amazon Buy 240 volt 1500 watt at Amazon 2000 watt 12 pack 2500 watt at Amazon 3000 watt at Amazon 3500 watt at Amazon 3800 watt at Amazon 4000 watt at Amazon 4500 watt at Amazon 4500 watt 12 pack |
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brands of thermostats are interchangeable $48 for 2 low density 240 Volt 4500 watt elements/ + Upper and lower thermostat  Buy LOW density kit: Apcom plumbers pack Amazon 110°-160° Resource How to replace elements |
$35 for 2 high density 240 volt 4500 watt elements + Upper and lower thermostat  Buy HIGH density kit: Apcom plumbers pack Amazon 110°-160° Resource How to replace elements New water heaters have high density elements. Low density elements might last longer |
$45 for 2
low density 240 Volt 4500 watt elements/+ Upper and
lower thermostat Buy LOW density kit: Therm-O-disc low density plumbers pack 90°-150° Resource How to replace elements |
$45 for 2 high
density 240 Volt 4500 watt elements/ + Upper and lower
thermostat Buy HIGH density kit: Therm-O-disc high density plumbers pack Therm-O-disc high density Therm-o-disc high density / copper element 90°-150° Resource How to replace elements |
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