In article o.uk, Dave
Liquorice writes
On Wed, 19 Dec 2012 13:56:56 +0000, fred wrote:

It's the cogs that have worn out so it's a complete replacement. One of
my reasons for being not being a fan Honeywell's enforced proportional
thermostatic control with multiple cycles per hour, it's wearing out my
controls prematurely.

Danfoss kit has the abilty to turn the valve knakering proportional
control off, in fact the instructsions tell you that doing so is
adviseable on systems with zone valves.

Yes, there are a few that are switchable, inc Siemens. I'm about to
install a Salus RT500 and an RT300 as a trial to see if they'll do,
they're non proportional and definitely budget end but if I fully
implement one room per zone then I'll be needing quite a few.

Such a shame as the Honeywells are so easy to set/use.
--
fred
it's a ba-na-na . . . .