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I have a Reliance 640 Dort water heater. The power went out yesterday, came back on, and a day and a half later it quit working. Think theyre related?

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Check the elements they may have burnt out

Posted on Sep 15, 2010


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How do I turn off the water heater?

There is a tap on the water inlet pipe to turn off the water. there is a switch in the power box to turn the power off.

Oct 02, 2014 | Reliance 6 50 DORT 606 Series 55 Gallon...

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We are an Ace Hardware Store and we sold a water heater to a customer, and the sticker on the outside of the box that had the information for energy was discarded by us and now the customer wants the...

Dort is Reliance.
6-50 Dort is 606 series

Your Customer wants energy factor.
Pdf below shows energy factor for 606 series:
55 gallon has .90 energy factor.

4500 watt water heater costs about $48 per month with electric prices at 12 cents per Kwh

Read about energy factor:
" efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day. This includes the following:
  • Recovery efficiency - how efficiently the heat from the energy source is transferred to the water
  • Standby losses - the percentage of heat loss per hour from the stored water compared to the heat content of the water (water heaters with storage tanks)
  • Cycling losses - the loss of heat as the water circulates through a water heater tank, and/or inlet and outlet pipes." end quote
Energy factors exist so large appliances can be compared to small appliances.
-This is like comparing aircraft-carriers to small ships.
-The purpose is so large gigantic appliances look like reasonable energy alternatives, when that is not actually true.
-The aircraft carrier could have better efficiency number than smaller ship, and it gives misleading appearance that aircraft-carrier will save the consumer money. Many of the super high-consumption 80 gallon water heaters have higher energy factor, but they consume huge amounts of energy each time operated. Simple Dort series is a better value even with lower efficiency number.
-The efficiency number is only for a new product. There is no measure showing how long that product will maintain the efficiency rating.
-And lastly, the manufacturer is putting energy factor on the product, like writing your own performance review, so who can possibly double-check the energy factor.

Dec 29, 2010 | Reliance Water Heaters

1 Answer

There is a Reliance 640 dort 40 gallon water tank installed in my bedroom closet. It's a mobile home and I rent. It's bad enough that a home model is in there and is larger then a mobile home water tank,...

Water heater explosions are extremely rare.
I do water heater research including insurance data on water heaters >>> the insurance industry has no reports that I've ever seen of exploded water heaters.
The water heater manufacturers experimented on prior generations, so now our water heaters are safe.
You can turn the water heater off when it is not being used.
You can also set the temperature to a modest 120 degrees and then the water never gets hot enough to cause any problem with the TP valve (drain pipe) or any problem burning you when you use hot water.

If you have a gas water heater, the TP valve will start dribbling water if there is ever a overheating event. So you will see it starting to get bad and then you can report the problem to your landlord

If you have a electric water heater, electric water heater has 3 safety features.
1) The circuit breaker
2) An energy cut-off red reset button located behind the top panel.
3) The TP valve

Here's another solution. Put a metal paint can or metal pot under the TP valve pipe where it comes down to the floor. Do not cap off this pipe.

My last solution is one my friend took when draining his water heater in a rented trailer. He drilled a hole in the floor. Your TP valve should exit the trailer. His solution might not be right for you. But take some photos of the problem and keep them in store in case the landlord refuses to refund the deposit.

Rest well. Every trailer, and every home has a water heater. I worked in the trades for 30 years. I never saw or read of one exploded water heater except the mythbusters video on U-tube (which is entertaining and shows how far a water heater has to be pushed before there is a problem).


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I have reliance 501 electric hot water heater, and currently have no hot water. Can't locate owners manual. What could be causing the problem.

There is an address near the end of this link to request manuals of reliance water heaters not listed.
it is quite possible that your heater works on the same principle as one of the other models and just differs in capacity or power rating.


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Water gets burning hot and trips reset on thermostat and theromast was replaced and still doing it

Is there a temp setting like hi,med,or low? That control works like a rheostat. If it is shorted it will keep the elements full powered and you will have this problem. Has the pressure relief vale gone off yet? Make sure it works so you don't have pressure damage to the plumbing . Now back to the thermostat. Try turning it all the way down. If it continues to heat, The rheostat is defective (temp control)

Nov 15, 2009 | Reliance Water Heater #6-30-DORT 30GAL...

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Heater keeps tripping the reset on the thermostat

it's not the thermostat it's the element they are whats in the water and when the seperate thats what trips it,, you need to drain the unit with the electric off and do not turn the power back on till water is comming out of the hot side faucet they must be in the water before the power is turned on

Jun 11, 2009 | Reliance Water Heater #6-30-DORT 30GAL...

1 Answer

Residential electric hot water heater throwing br

If you reset the water heater the first time you were without, Then odds are it is the water heater. probably an element went back. If the power off check for continuity.

Please rate this response and Good Luck, Phil


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