Question about Grundfos Comfort System Recirculator 595916

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Grudfos controller next to water tank is making a vibrating noiseand is very hot. All pipes from tank warm up although the top ones are someimes hot and the bottom pipes are cold. Any suggestions?

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SOURCE: Grundfos installation with Buderus boiler. Pump

Do you have more than one zone? If so, it is difficult to tell if the circulator in question is actually running. A trick is to get a screwdriver and place the metal end on the front of the circ and the other on your ear. You will hear it if it is running. If you do hear it, is the circulator itself very hot to the touch? If it is, it may be burnt out, or the zone needs to be bled of air. Another doubtful, but possible, answer is that the circulator is installed backwards. There is an arrow on it and it should be aimed towards the flow of water.

Posted on Dec 31, 2009

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1 Answer

Water pressure


Here is what should be going on.
There is a length of pipe between the hot water that is in your tank and the nozzle you are expecting to get it out of.
It is really possible the are nearly 3 gallons of water in those pipes, especially if the water heater is many feet from the faucet.
Now about the drop in water pressure.
Try the cold water.
Does it do the same as the hot? Does the pressure drop after 2 - 5 minutes?
If so, suspect your pipes are clogged with sediment. How old are the pipes and the house/apartment?
Does the water contain minerals that clog pipes?
If the cold water is good, and the hot not, I should suspect there is blockage in the hot water pipes, especially going in to or coming out of the water heater., or perhaps the faucet is clogged with rust or deposits.
God bless your efforts.

Oct 19, 2015 | Water Water Heaters

2 Answers

How and where does the water go in


The cold water enters the top, but the water is not released into tank at the top. The cold water goes through a "dip tube" This takes the cold water to the bottom of the tank. If you dip tube fails, or breaks, your faucet temperature will slowly drop as you use hot water (vs giving you 60% of tank at full temperature before temperature starts dropping) In normal operation, the cold water is released near bottom of tank, the hot water rises to top, and comes out of the top of the tank.

Jan 27, 2015 | Water Water Heaters

3 Answers

Adjust water temperature


It is possible that there is an open valve on the back of the water heater which is allowing the hot and cold to mix. Locate the back of the water heater. You will see a water line going into the bottom of the water heater. That is cold water in and there will be a valve on that line. It should be open (The handle inline with the direction of the pipe). At the tope there will be another pipe coming out. That is the hot water out. It may or may not have a valve but if it does make sure that it is open. Then there will be a water line connecting the top and bottom water lines and it will have a valve in it. Make sure that the valve in this line is closed. That is a winterizing bypass valve. If this does not correct the problem let me know and I will give you more steps to consider.

Apr 07, 2014 | Heartland 2013 North Trail NT 24RBS

1 Answer

Hot water in kitchen only froze


good idea to let the cold water to run a bit to stop freezing up . Pity that you didn't do the same with the hot water. There is only hot water in the tank but the water in the hot water pipes will freeze as the heat goes out of the pipes. (Always to have to wait for the hot water to come through when you use the shower or bath.) The water will freeze up right back to the hot water tank

Jan 29, 2014 | Cars & Trucks

1 Answer

I have a Reliance 606 natural gas water heater. It is 8 years old. The pilot light went out on it and I replaced it. I lit the heater and waited 30 minutes to check the water temperature. The bottom of the...


1) Bad gas control thermostat, or thermostat has come out of calibration, or water leak running hot water out of tank.
Turn up temperature.
Replace gas control valve.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

2) Clean air intake, put ear against pipes and listen for water leak, check that flame is clear blue and that combustion gasses are flowing up the vent pipe and not blocked.

3) Call service technician.

Dec 31, 2012 | Reliance Natural Gas Water Heater Control

1 Answer

Hot water noise when tap is turned on louder when full on at tap. Atwood MOdel GC104A


Noise in pipe means vibration.
Pipes vibrate when water turns corner, or if there is a clog somewhere in the line, or if there is air in the line.
Water heaters make noise when sediment builds up inside of tank.
I would probably try to track location of noise, and then put that spot on top of suspect list. For example if sink has shut-off, and noise seems loudest there.

May 08, 2011 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

How does rhe hot and cold water hook up on a 71-40d which is which top and bottom


Tanks are marked with Hot and Cold.
1) If water connections are on top of tank, look for red marking or word HOT that shows where hot water pipe connects. Look for blue marking or word COLD that shows cold water connection.
2) If water connections are on side of tank, cold water connects to bottom one, and hot connects to top.

3) If hot and cold are reversed, the tank will not work.
Pipes on top of tank: cold water enters tank and is sent to bottom of tank in a long tube called the dip tube. This means the cold is on the bottom since hot water rises to the top. The hot water exits top of tank.
Pipes on side of tank: You want cold water to enter bottom, so hot water naturally rises to the top outlet.

Nov 14, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

2 Answers

Water starts of hot but then starts to get cold.


You need to verify that you still have hot water. Sounds like you're running out.

Sep 28, 2010 | Home

1 Answer

I have a rheem hot water tank when you turn on the hot water it comes out nice an hot but not even 30 secounds after that the water cools off and it stays as just warm water. I hear the gas kick in to heat...


Could be your thermostat but it might be your inlet dip tube. Your water heater has a plastic pipe that carries the cold water to the bottom of the tank. When you open your tap, it takes the hot water from the top of the tank, the cold goes to the bottem and gets heated. If this tube breaks, or comes loose, it will short circuit the cycle. The tank is hot but as soon as you start using water, cold water comes in at the top and mixes with your hot water, giving you just warm water. If you have room above your tank, you can remove the union on the cold side , screw out the pipe nipple, and look inside and see if there is a tube. If not you can buy one from home depot or lowes for just a few dollars. Also a water heater should be partially drained annually to remove any solids from the bottom, which will allow better heat transfer.If you find bits of plastic when you do, then you know where your dip tube went. Also if you've had a hot water faucet stop up and it looked like plastic there it is.

Jun 21, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

2 Answers

ENGLAND, UK. DOMESTIC HOUSE CENTRAL HEATING. Baxi Bermuda


try bleeding the radiators in the order of downstairs first and then the upstairs and try to bleed them in the order they fill, trapped air can take a while to escape, a good sign on a radiator is the bottoms being warm where the tops( where the air is trapped) stays cooler, a sure sign to which radiator needs bleedin, hope this helps, colin

Apr 02, 2010 | Heating & Cooling

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