help with a mixer shower problem

[craigy3]

Ok when i bought my house almost 3 years ago i fitted a thermostatic mixer shower

however i always had a problem where if i had the temp at say mid all preasure dropped

you had to have the temp on the shower up full and then have to turn down the tep on my combi boiler to have presure and a normal temp

however i was then told it might be the fact that i still have a storage tank in the loft and the difference in presure would be casuing it

so i removed the tank and now all feeds are mains presure

however the problem continued

so i then thought it might have been a faulty shower unit so replaced it with a new unit and still i get the problem

anyone know what could be causing this ?

 

[secret squirrel]

I am a little confused are you now on a combi boiler and before you were on a system boiler. I ask because you've had tank removed from the loft. What system have you got

 

[Plamber]

is it a mixer valve?? maybe you need to replace the shower cartridge.

I've had to fit a few recently that have had similar problems. either randomly stopping or water going hot then cold.

 

[craigy3]

when i moved in i had a full central heating system fitted as it was electric heating

so i have a combi boiler but i still had the cold tank in the loft (thats the way the guy left it )

however that tank has recently been removed as i was told this might have been the cause for my problems with the shower due to the hot being mains presure but the cold not

however it wasnt the problem so i bought a new thermostatic mixer system to replace the one i had and still the problem persists

 

[secret squirrel]

Ok, forget the old problem because it'll confuse the possible cause.

At the moment you have to turn the temp up fully on the shower so that you have a normal temperature shower?

This could be down to in equal pressure on the cold and hot entering the shower. The cold may be overpowering the hot.

You need to test the pressure of the water on the hot side and cold side and then if there is a big difference fit a prv.

 

[craigy3]

ok

so how would i test the presure of both ?

also how come the presure is fine if the temp is regulated by the boiler water temp ?

also would i have been easier fitting a non thermostatic mixer shower ?

 

[WHPES]

You would need to know the dynamic pressure rather than the static pressure. I know its a bit rough but you can get a basic idea by putting your thumb over the oulet and running the hot, and then the cold.

A PRV often solves the problem.

Fitting a head with smaller holes sometimes is the easiest way to solve the problem if the issue is down to flow rates from the boiler.

Would not have made any difference fitting a non TMV shower, in fact it would probably be less satisfactory.
The thermostat on the mixer may not be set correctly.

 

[Plamber]

what kind of mixer shower is it?

 

[craigy3]

one was from b+q originaly

this is the other one i got from flee-bay

MUSLIM SHATAFF BIDET DOUCHE SHOWER MIXER THERMOSTATIC on eBay (end time 08-Feb-10 16:42:23 GMT)

 

[secret squirrel]

Have you considered paying a professional to come in and have a look for you? Not wanting to be obstructive or rude but this is not a major issue and could be sorted out at relative little cost. Especially as this has been a problem for a while. It is going to continue to give you a headache until its sorted so let someone else have the hassle for you.

 

[craigy3]

Have you considered paying a professional to come in and have a look for you? Not wanting to be obstructive or rude but this is not a major issue and could be sorted out at relative little cost. Especially as this has been a problem for a while. It is going to continue to give you a headache until its sorted so let someone else have the hassle for you.

i had a guy in to remove the tank and he had a look and it was him that said he thought it would be the shower unit