Anyone know of or can recommend some particuarly good quality TRV's. I've got a customer who is anxious as he has had 2 leaky trvs in a 9 year old house which caused a bit of damage. I was going to swap them (whole house) for Drayton TRV4's but wondered if there was anything better out there - none of the trv's I've seen seem to have any long life warranty etc.

Any thoughts please ?

drayton trv4
liquid sensor
bi-directional
range & limiter
frost protection or positive shut off.

little dearer but they never play up