I have an easi boost power shower. it is about 18 months old. last
couple of weeks if i turn hot tap on upstairs or downstairs -when i
turn the tap off the shower pump fires up for about a second or two.
i have no idea why its doing this but its driving me mad. any ideas
how to cure it - the shower is fine otherwise
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Re: easiboost power shower - problem
It comes on when the pressure changes so when you open another faucet it changes the pressure and makes it come on,, check your pressure regulator valve on the main line comming into the house it has a screw in the center, if you have a pressue gage put it on either the water heater drain or out side hose bib , check the pressure when turning water on and off if it changes more then 5 lbs you need to change your prv valve. pressure regulator valve,
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Put that water in a glass and let it sit for a couple of hours. If it clears up, it is air bubbles. The old unit most likely had mineral deposits on the elements and they insulated the water from micro heating that creates the bubble. Since the unit is new, the water is in direct contact with the heating elements and micro bubbles are forming on the elements. When you turn the hot water on, the turbulence washes the bubbles out.
The hot side of the faucet is most likely plugged with something that came up thru the water system. The average thankless waterheater requires at least 1/2 to 3/4 gpm flow rate for the unit to sense flow and turn on. If there is not enough flow it will not fire and heat the water. Not sure about this particular unit but a few require at least one full gallon per minute flow. So chances are that if you fix the faucet, you fix the hot water issue at the same time
Type of water heater is unknown If you have single-handled faucet the faucet cartridge might be bad. If you have recirculation system, then check valve might be bad. Copy following links for troubleshoot. http://waterheatertimer.org/Crossover.html http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
lower the output temp on the unit. the tap water could be too cold coming in. The bosche units don't like a large temperature difference between tap water and the water at your shower head. Condensation becomes a real problem. I run my water thru my basement slab to heat it up and that made all the difference, but you probably didn't buy your house with a dirt basement did you?
I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!
Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)
Turn the gas knob up. There's a dial on the front (probably red) and it will have settings on it. A B and C. Turn up to desired temp, but be careful of faucets if there are children in the house. Good luck
there is a little cap on the hot and cold side above the shut off valves, turn the water off at these valve and take the caps off there are filters in there clean them off and reinstall them that should take care of the problem, you might want to flush the tank while your at it hook a hose to the hot side connector and run it out side or to a sump pump then turn on the cold water and flush it out you can also reverse this procedure by doing it on the cold side