What's a 'TMV'

[PowerFlusher2]

Tmv - ?????

 

[Billy Bob Bob]

Re: demistifying your plumbing

Tmv - ?????

thermostatic mixing valve

 

[PowerFlusher2]

Re: demistifying your plumbing

thanks for that. would never have got to 'thermostatic', doesn't look anything like my thermostatic rad valves, never seen one of these before, where is the thermostatic controller bit?

 

[Guest123]

Re: demistifying your plumbing

Tmv - ?????

TMV = Thermostatic Mixing Valve. Available in many sizes. Standards are TMV2 for domestic use and TMV3 for commercial and more critical use such as hospitals.

 

[Billy Bob Bob]

Re: demistifying your plumbing

thanks for that. would never have got to 'thermostatic', doesn't look anything like my thermostatic rad valves, never seen one of these before, where is the thermostatic controller bit?

its normally used to decrease the temperature of hot water at a outlet,example where young children may be users or the old and infirm,it is normally set to 35 degrees to prevent scalding

 

[PowerFlusher2]

Re: demistifying your plumbing

many thanks for that, all. fully understand what and why. never worked in other than a normal domestic environment so not something that one would expect to find in a house installation, then? - certainly not come across even one in any of the many thousands of houses I have done water pipework (non-gas, never did CORGI or GAS SAFE) in up to my retirement in 1998.

 

[Guest123]

Re: demistifying your plumbing

TMV's are now more or less standard in all new domestic installations and certainly in public buildings and sports pavilions with multiple showers and wash basins. They are primarily designed to prevent scalding.

 

[Billy Bob Bob]

Re: demistifying your plumbing

many thanks for that, all. fully understand what and why. never worked in other than a normal domestic environment so not something that one would expect to find in a house installation, then? - certainly not come across even one in any of the many thousands of houses I have done water pipework (non-gas, never did CORGI or GAS SAFE) in up to my retirement in 1998.

i fitted one in a domestic environment 40kw BAXI duotec fitted ,this boiler will take your skin off in DHW mode,the lady of the house is a registered child minder ,basin the kids use has a TMV fitted

 

[mastazero]

greetings

greetings from Switzerland )

 

[Guest123]

Re: greetings

greetings from Switzerland )

Love yer toblerone mate.
Welcome, but you're posting in the wrong thread, post in the new members thread please. This post is about TMV's not yodelling.

 

[peteheat]

TMV's are becoming more common in the domestic sector with the use of solar and pressurised cylinders.

I heard somewhere that they will be included in some standard or other as a "must have" in the domestic installations, like everything else that requires laws don't hold your breath waiting for it to be implemented.

 

[GQuigley67]

they are required in new installations or new bathroom installations so i heard not 100% sure i remember reading something about it at the back of the plumbfix catalogue, fitted loads of them on hospitals where we set them to around 41 degrees.

 

[Guest123]

Re: greetings

Here's a link to the Thermostatic Mixing Valve Assocation, who are the governing body for manufacturers of TMV's. All the up to date info and regs about TMV's can be found there and there are uselful PDF downloads:

[DLMURL="http://www.beama.org.uk/en/energy/thermostatic-mixing-valves/"]Thermostatic Mixing Valves[/DLMURL]

 

[JJayMan]

I used a TMV to mix my hot heating water (on the rrturn side) prior to it going into my underfloor heating so that my tootsies cannot get too hot.

 

[AWheating]

TMV's are becoming more common in the domestic sector with the use of solar and pressurised cylinders.

I heard somewhere that they will be included in some standard or other as a "must have" in the domestic installations, like everything else that requires laws don't hold your breath waiting for it to be implemented.

just make sure the one used on a solar system is rated for this use as standard ones normally are not rated for the possible temps you can get on solar system.

 

[peteheat]

just make sure the one used on a solar system is rated for this use as standard ones normally are not rated for the possible temps you can get on solar system.

Hi,

Sorry I didn't clarify what I meant, the TMV doesn't go on the solar system it goes on the hot water feed off the cylinder and when mixed with a feed from the cold supply gives a controlled temperature to all hot water taps, showers etc

Very useful with solar and solid fuel stoves where the temperature in the cylinder can exceed 70c, they can also be used on a cylinder with any fuel such as electric immersion, gas or oil.

The purpose is to control the temperature at the draw off point (tap), vital where there are children or elderly who may get scalded using an uncontrolled system.

I think you may have confused my earlier answer with diverter valves for solar to heat dumps or some east / west configurations where we use Resol three port valves.

 

[sue2492]

Is there an easy way to adjust the TMV my water upstairs is too cold !

 

[scotty plumber]

Is there an easy way to adjust the TMV my water upstairs is too cold !

Yes, at the bottom of the tmv you can adjust it normally by taking off the cap and using an adjustable ( depending on which type it is ) but tmv's normally range between 37-45 degrees so even if they are up to full temperature it can still not be hot enough.

 

[peteheat]

Some TMV's can go from 30 > 70c the standard type can be adjusted by turning the top similar to a radiator valve.

The type that require tools to set should not be adjusted by anyone who does not understand how they work, that is one of the reasons tools are required.

sue2492

You say the water is cold upstairs, does that mean it is OK downstairs?

Has it been that way since it was installed or is a problem that developed over time?

I recommend that you contact the plumber who installed it especially if its part of a pressurised cylinder as they should be serviced every year purely on safety grounds.