Question about Water Heaters
Recirculation pump runs 24hrs a day to 4 levels. Does this pump allow the free flow of hot water when turned off? Ours appears not to as we then only get Luke warm water. The recirculation appears to constantly cool the hot water and we therefore need 240volts all the time. our quarterly Hot Water usage is 4000 kw - 2 people careful with usage. No swimming pool. Can you help?
Cost calculations for recirculation system vary widely.
These systems cost more, and they cause higher operation cost of water heater.
1) When pump is OFF, then hot water is no longer leaving the tank.
Most recirculation systems have choice of timer for setting specific times of operation, or thermostatic operation that activates pump when sensor detects temperature less than 90 degrees
2) Condition of plumbing is suspect here because you are not receiving fully 90 degree hot water from the recirculation system.?.
Bad single-handle faucet cartridge, or bad recirculation check valve, are causes of crossover. Clean recirculation check valve with white vinegar. Replace worn faucet cartridge.
Test for crossover.
3) There are other suspects, such as water leak.
Drips, broken pipe, bad TP valve.
Turn off all taps and put ear against pipe to listen for running water.
4) High costs: Lifting single-handle faucet in middle will immediately cause cold water to enter tank. Even if no hot arrives at tap, because the cartridge is drawing both hot and cold in equal amounts when handle is lifted in middle.
Today it is more efficient to install dual-handle faucets so tank is not receiving constant dose of cold water when single-handle faucet is not used correctly or tediously.
Posted on Oct 30, 2012
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Posted on Jan 02, 2017
SOURCE: boiler overheating
the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim
Posted on Oct 18, 2008
Possible thermostat problem. Are you experienced enough in that area to do some testing. Have a multimeter? If not experienced, don't try it, too dangerous. Call in a service person.
Posted on Mar 07, 2010
SOURCE: HI, HOW TO CONNECT 2
The WH 40 is a double throw switch, meaning that it will switch two contacts simultaneously. If you are switching the pool pumps with this WH 40 they will all switch at the same time without the desired delay. (You do not mention how the pumps are switched).
To connect the timer for the elements, a live and a neutral are needed to run the clock.
A live is connected to the two switched 'in' terminals and two wires must then be run to each of the coils on each of the two relays.. A separate live must go to each pole of each relay, the switched live then goes through the thermostats and to the elements.
A neutral must also go straight to the neutral side of each relay coil and to each element, unless you are using double pole relays, in which case you can switch both the neutral and the live wires going to the relays (this is the preferred circuit). Then each switched live will go to a thermostat and the switched neutral will go the other terminal of the heater element. The elements you are using are very heavy and your relays will have to be able to handle around 120 amps at 110 volts or about 60 amps at 220 volts. At 220 volts your 40 amp contactors will only handle 8.8 kw with no safety margin.
If you want a safety feature to time the pumps and elements separately, you will either need two timers or perhaps a pressure switch or flow switch to isolate the heaters when the pump pressure or flow falls.
Come back to me if this layout does not agree with what you have in mind or I have not made any point clear enough.
Posted on Apr 01, 2011
SOURCE: I have a gas Rheem
Sounds like you have cold water entering the hot pipe, or crossover.
(A) Put bucket under water heater overflow pipe, and stand back from scalding water. Gently open and close the TP relief valve on water heater. Check temperature of water to see if heater genuinely has hot water.
It could be the water heater has sediment build-up and is no longer able to heat the water, or the gas thermostat is bad.
(B) If water heater has hot water, and hot is not getting to faucet, then you have a crossover problem somewhere.
1) This problem can be located at crossover point of a recirculation system, if re-circ check valve has failed.
2) Failure of a single handle faucet cartridge can cause crossover.
Read how to test for crossover:
3) Other causes for crossover are a failed check valve elsewhere in the plumbing system, for example on the pool equipment. Also a failed mixing valve which is usually installed on top of the water heater so that some areas of the house like laundry room receive very hot water, while the kids bathroom receives lower temperature water.
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Posted on May 16, 2011
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