Danfoss HS3 3 Port Motorised Valve
Non standard compression nuts
Just a warning so you don't find out the hard way like I did. The compression nuts are not your normal 22mm type, the thread on these is much finer pitch. I found out when I had to take them off while modifying my pipework. I used a standard 22mm nut which tightened up but I didn't notice until it sprung a leak when I refilled the system because of the different thread pitch.
Whatever you do don't damage/ lose the original nuts!
For that reason I can only give this product three stars.
17 Dec 2014
This was a direct replacment for the one that had failed. The last one's warranty ran out back in 2007, so by my reckoning the unit lasted roughly nine years! Which hopefully the new one will do the same.
1 Dec 2014
Not reliable in the long term!
I first fitted this valve to our central heating 20 years ago. It took 10 years for the electrical actuator to wear resulting in the unit failing to properly complete its activation... click, click, click, as the motor repeatedly tried to complete its task.
Bought a new one and changed the electrical actuator only... but noted (when cold) that the valve spindle was weeping very slightly.
The replacement electronic actuator has now failed with exactly the same problem... The valve spindle is leaking excessively so I have ordered another manufacturer's product in the hope that I won't have to attend to this matter again!
24 Sep 2012
danfoss 3 port valve
bought this valve because 4 other plumbing stores on the same estate did not have one in stock, so hats off top screwfix, valve was spot on , exactly as required , 4 wire connection
16 Feb 2012