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The electic shower keeps going cold for a few seconds then hot

Our shower has started to run cold for a few secomds then will run hot. I have turned the hot water up on the boiler and checked the pressure all seems in order
The boiler is a RAVENHEAT. I dont know what make the shower is, its fitted over the bath, but all you can see is the on / off dial knob type switch, and a similar and the same kind of dial for the temp. The Shower was in when we moved in.

Any ideas what I can do before I call a Plumber.

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Why do we need to have to continuously adjust the temperature of the water when we're taking a shower. We have a new Rheem gas .hot water tank


It *may* not be a problem with the water heater itself necessarily. When you say "keep adjusting the water temperature when you're taking a shower" I presume you're talking about turning the shower hot/cold knob(s) and not the temp thermostat on the water heater itself.
If so, when it starts to run colder, turn the knob all the way to full hot. Is the water then very hot? If so, the water heater is working fine & doing its job, and the problem is likely to be in the shower faucet mixing valve itself. Sometimes a faulty one will expand the inner seals/cartridge as hot water flows thru it, and starts to (wrongly) restrict the hot water flow, thus causing the constant need to "turn the dial up a notch".

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Hot water varies


I do not know how old this unit is or what model but many water heaters are not sophisticated enough to measure the temperature, but heat based on water flow and temperature rise. To start, tankless water heaters turn off every time you turn the hot water off. Lets use an example. You use the facilities, wash your hands then turned off the water and take a shower. You will bring the already heated water (from washing your hands) from the pipe up to the shower. Then the cold water that comes into the pipe from the reactivation of the water heater comes up the hot water pipe with warm then hot water just behind.

If this is not your problem, keep reading. Every unit I have been called to see were installed wrong. Check your installation manual to see if the problem with the system started with the contractor.

First, check the temperature of the water from the heater. If it is too hot and you are mixing too much cold water in, the unit will turn off because there is not enough water flow to keep it running.

Second, turn off the valve at the water heater and turn on the hot water at a faucet. If the water does not stop running, there is a "plumbing cross over" usually caused by a failing pressure balance valve in a shower.

Third, if the unit has not been serviced, go to bosch-climate.us to find a tankless water heating professional in your area. Totally Tankless LLC

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1 Answer

Moen single handled shower the hot water turns cooler then cold after a minute


Your whole house is likely plumbed wrong so that it is impossible to have equal pressures of both hot and cold at your shower. If you had your home plumbed with aquapex using a radiator for the hot water and a radiator for the cold water and have the radiators fed with a 1 inch line you can have close to perfect pressures.

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1 Answer

My Bristan Meridian Show start ok with hot water then after a few minutes the water runs cold. Even if you try and increase the temp it still remains cold. You can switch of the shower and start again...


It sounds like 1 of 2 things to me. I will start wit hot water heater. The first test for the water heater is to have someone run the hot water while you hold the hot and cold pipes and see if the water is coming out of the water heater cold when the shower goes cold. Of the water heater is cold coming out then the problem is in the heater. ether a lower element is bad or the dip tube is broken at the top of the tank. if the hot water heater continues to put out hot water when the shower goes cold then it has to be the mixing valve for the hot and cold mix at the shower and that valve will have to be repaired or replaced. hope this gives you a good start. let me know if I can help further.

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1 Answer

My shower is run off a combi boiler and recently started to go cold for a couple of seconds every few minutes and nobody is running water elsware in the house.


Check the hot water flow at the shower - if it's as good as other taps the boiler diverter valve is suspect. Replace either the complete valve or the internal rubber diaphragm, depending on the boiler make

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1 Answer

My shower ok for mins, then cold, then after 5 min too hot


replace your mixet stem it is located behind the knob where you adjust your hot and cold water you will have to turn your water main off then you will need a flat head screw driver a phillips screw driver a pair of needlenose pliars to pull it apart

Mar 11, 2010 | Delta & Single Handle Shower Faucet

1 Answer

Tankless on demand water heater.


Tankless water heaters normally take a little longer than a regular heater to provide hot water because they have to start and get warmed up. I'm guessing the heater uses a pilot light and that the short amount of hot water when you turn on the tap is hot because when the water is sitting still in the heater the heat from the pilot light is enough to get it hot. The tub faucet will get hot a lot faster than the shower because it lets a lot more water through and empties out the pipes faster than the shower. You could probably speed things up by letting the tub faucet run on completely hot for like 10-15 seconds and then turning on the shower.

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Vaillant ecoMAX 828/2boiler goes on & off when running hot water!


water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

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2 Answers

I have exactly the same problem


you need to change the cartridge, it is a temp control and is going bad so it keeps you from burning yourself it is like a mixing valve and is givng more cold water, that way you don;t get burned,,

Jun 18, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

2 Answers

Not enough hot water, has to do with a shower valve


Hello, first if any water supply hot or cold is turned off, you will experience trickling as you mention. You must have both cold and hot in order to adjust the temperature on your valve. if you had a plumber intall this unit you should ask him to adjust it. Otherwise here is how:
Rotate the handle counterclockwise to stop and let water run till cold water is purged, check
temperature. Rotate handle to off, remove handle parts (see Disassembly in your manual) and temperature limit stop, rotate clockwise to decrease and counterclockwise to increase maximum hot water temperature, reinstall temperature limit stop and handle (TIP: Do not screw handle in until desired maximum temperature is achieved) Repeat steps until desired maximum
temperature is achieved

Feb 21, 2009 | Moen 3175 Legend One Handle Shower Faucet...

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