Discuss Cold water tank in the attic overflowing in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Yeah I get it. If the F&E is higher than those two then it will try to level itself out. But the F&E tank is only a small 10 gallon tank so I don’t think it’s higher than that big tank. However I will check.Thank you we are happy to help but likewise we don’t want to see someone flood their house. Do you understand the science of what I was trying to explain
This is what a meant by small. It isn’t possible for the CH tank level to be higher than the other two. Woke up this morning and the tanks are full again. And the CWSC is warm with the feed pipe very hot to touch.The water level is the key factor not the actual size of the tank
Also if the coil was split would the water in the hot water tank be dirty? As it was relatively clean.Ok then it’s impossible to tell from the angle of your pics the levels. That will be down to you. As long as the water in the f&e is lower than that in the larger tanks then you can rule out split coil. Only logical other fault then would be one of your mixers passing
Yeah will go around turning off the isolators on each tap and checking to see if the flow has stopped. Hopefully find it that way.If you have isolators on mixer taps you will need to turn them off systematically to work out which one. My bet would be a shower
Cold feed to cylinder on the one tank. The other tank has a cold feed to the pump for the bath (both hot and cold tank fed)How many pipes come off the two larger tanks you have a cold feed to the cylinder. Anything else?
Pump does whole house, hence I thought if I used the isolation valves on the pump it would stop any backfilling mains. But either the isolation valves aren’t turning off fully or im barking up the wrong tree. However I can feel the pipes on the pump they are cold as if mains water is flowing through.Sorry I’m getting mixed messages with this does the pump do hot and cold water for the whole house or just for one shower
Kitchen mixer is pumped, turns pump on etc.Kitchen mixer won’t be pumped
Yes. 3 taps and shower are all like that.Only on hot, the cold should be straight from the mains
Tried that. But either the isolating valves aren’t closing fully or I’m on the wrong track.Surely you can just isolate the pump on one of the flexible hoses
Ok so NRV fitted. Isn’t coming back into the tank at the moment but maybe because I turned everything off to fit the NRV. Will check it over the course of the day to see if it’s come back. Thanks again for your help will keep you posted.
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So, true mixer taps with different supplied water pressures can create backflow when the taps are off? Within the body of the mixer tap?Yes they can
My issue was the shower mixer rather than the taps. But was flowing through when offSo, true mixer taps with different supplied water pressures can create backflow when the taps are off? Within the body of the mixer tap?
Have traditional vented indirect system, in my case F&E tank base same level as large tank, so top level below, F&E tank overflows/steady trickle, maybe one bucket every 3 hours, also somewhat brownish water (water from taps crystal clear), guess it is coil, or could system be too hot (at one stage hot water was VERY hot), any suggestion?The small tank will fill your central heating the big tank fills your cylinder. Assuming it’s piped correctly the only place these to waters come close is in the coil in the cylinder, central heating water inside, domestic hot water outside. There could be a small pinhole in your coil meaning that when it heats and expands water from the smaller tank is able to pass into the domestic hot water. This then effectively makes it all one circuit no longer separate so the two tanks in the loft will try and achieve the same water level. This will only be the case though if the water level in the smaller tank is higher than that in the larger tank otherwise the same would happen only in reverse
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