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Will
a
fused element dry
fire? Yes it can, but the resistor (fuse) reduces chance of 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 |
 Rheem
marathon element wrenchBuy: 1-7/8" water heater element wrench/ Use screwdriver for handle Professional 1-7/8" sockets Buy socket: 1-7/8" socket with 3/4" drive 1-7/8 sockets at Amazon 24" breaker bar with 3/4" drive |
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Upper
element has a fuse to help prevent dry fire, but Marathon elements are
interchangeable as long as length of element does not conflict with
tank diameter. Use 1-7/8 element wrench 1.5" UNF straight fine thread not 1" NPSM straight// 12-14 threads per inch vrs 11.5 Read parts .pdf before buying Buy: SP610160/ 4500 watt copper/ Best value SP213670/ 4500 watt SP210197/ 3800 watt SP210201/ 3000 watt SP210198/ 3800 watt SP213480/ 3000 watt SP213540/ 2000 watt SP610130/ 3800 watt SP213820/ 3800 watt SP610140/ 5500 watt SP610150/ 3000 watt Resources Marathon parts sheet/ pdf Regular water heater elements/ identify and replace |
| Why does
marathon water heater have fused upper elements? Question: Do I really need fused upper element if I am smart enough to never dry fire the upper element? Seems to me its just another part to fail. Answer 1: Fused upper element is NOT required for tank to operate normally. Fuse is not ordinary fuse that you can reset... it is a resistor that is added inside head of element. Upper element dry fires.. but lower element rarely does. What is dry fire? Element must be covered with water when power is applied, or upper element will burn out. Why only the upper element dry fires? Because 30 amp residential water heaters are non-simultaneous, which means upper element receives power first... so it is first to burn out. With non-simultaneous water heater, the lower part of tank does not receive power until upper element heats first... but if upper element dry fired, the top of tank never gets heated, so lower element never receives power... and tank is cold. Resource: How electric water heaters work Same answer different words: Marathon upper elements are fused to help prevent dry fire. Not 100% prevention... just resistance to dry fire. Elements will instantly burn out if they are not fully immersed in water. Upper element will dry fire, but usually not the lower element. Reason: Marathon is ordinary non simultaneous water heater: Upper element is ON, lower element is ON, or both elements are OFF When tank is empty, the upper thermostat is cold. Thermostats are mechanical bi-metal switches. [They require no electricity. They work with any AC voltage.] When upper thermostat is cold, the bi-metal switch is positioned to send power to upper element. When tank is cold, no power will flow to lower part of tank, until upper thermostat reaches set point. When power is applied to cold tank, power flows to upper element. If tank is not full of water, then upper element dry fires. Lower element is unaffected. When upper element is not working, then tank will not heat any water because lower element will never receives power unless upper part of tank is heated to set point. If upper element is burned out with dry fire, the water heater heats no water. Marathon elements are expensive by comparison to ordinary elements. If you dry fire ordinary element, the replacement cost is $10-20 from local hardware store. Marathon elements are not available at local hardware. Resources: How to wire thermostats How thermostats work |
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| He
is thinking using the 105 marathon as the primary grid powered and the
50 gallon using a techluck preheat. Im
interested to
see how the whole thing will work. -Dave |
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Where have you seen fused elements? http://www.ilovewaterheaters.com/products/service-parts/sp610160/ All the consumer marathon come with standard fused upper elements. Its possible to replace with titanium fused upper and I think I will get the titanium for the upper because of the way I use my water heater as an energy battery, the upper does come on a lot. Much more so than in a standard instantaneous grid install. http://www.ilovewaterheaters.com/products/service-parts/sp213790/ The only question I have why dry firing a upper element is more prevalent than dry firing a lower. Is it because if the upper element fuse trips on dry fire the lower never gets power and therefore never gets dry fired? Dry fire is probably big problem at corporate: |
| 1) Thanks for fused
element. I think these elements are dry fire 'resistant' Some of the new electronic water heaters show dry fire elements... but with further reading, they say resistant. Will keep my eye out for information about this 2) Upper element dry fires.. but lower element rarely does Because most water heaters are non-simultaneous: the upper thermostat sends power to upper element first, and only after upper part of tank is heated does the upper thermostat switch and send power to lower part of tank http://waterheatertimer.org/How-it-works.html |
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