Myson TRV 2 Way Replacement Thermostatic Valve Head Only

Myson TRV 2 Way Replacement Thermostatic Valve Head Only
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5.0 average, based on 24 reviews


Replacement head for Myson TRV 2 WAY thermostatic radiator valve (head only - no valve included).

This contract head is interchangeable with the standard Myson thermostatic head (which looks the same, but has red markings and a white bottom section).

Our video shows details of the head, including how to identify a faulty head and instructions on how to replace the head.

 Faulty Myson TRV head compared to a good one

Myson TRV heads are normally very good and last for many years, though one failure that can occur is an internal fault that causes the centre pin to be permanently stuck in the out position. This failure results in the valve not working and a cold radiator. The picture above shows two heads, a faulty one on the left and a good one on the right.

Myson TRV symbols
◯ OffOff
❆ Snowflake
Frost Protection
⬤ Max28°C

TRV 2 Way valve heads made between 1997 and 2012 had a symbol like the greek letter PI. This head, with the EN215 keymark symbol is a direct replacement.

The metal lock ring has a M30 / 30mm x 1.5mm metric thread. Myson has used this thread for a long time, though very old (pre 1997) Myson valves used a smaller 28mm x 1.5mm thread.

The picture below shows what the very old (pre 1997) thermostatic heads with M28 threads looked like. If you need to replace one of these you'll have to buy a new head and an adaptor (available in our store).

Old style Myson TRV head with 28mm thread

Product CodeMZG

Customer Reviews

Average Rating: 5

Exceptional Service

emailed company describing problem (radiator would not shut off). Received reply by return suggesting new control head required . Ordered yesterday at 11am, received today via Royal Mail 24 at 10am. Fitted by 11am. Exceptional service from Stevenson Plumbing. Many thanks to them. ( 4 Feb 2021, 14:04)

myson replacement trv head

great information provided on the web site about this product and item supplied at a competitive price. item arrived well packed and exactly 10 days after placing the order, which was good considering the distance involved in delivering it. excellent service, would use this supplier again if needed. ** NOTE FROM STEVENSONS - Normally postage is a lot faster, it can be a bit slower during the current Coronavirus pandemic ** (16 Dec 2020, 11:53)

Myson TRVs

No nonsense, simple to order and pay for, arrived really quickly, the images showing "faulty" or "good" were really helpful, when highlighting where the problem was occurring with the cold rads Thanks (29 Oct 2020, 15:42)

So easy!

Delivered faster than expected and was really easy to swap over. The video and photos of faulty and good really helped, I'm not a plumber - just simply unscrewed the old faulty one and replaced with new one. Voila! Hot radiator now. Thank you. Straight swap - no issues. (22 Oct 2019, 17:59)

Myson thermostats

Received order day after placing it. EXCELLENT service.Well done✅ (17 Apr 2019, 11:36)
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