woodglass wrote:
"Grumps" wrote in message
...
I assume that with a progammable thermostat (eg.
http://www.screwfix.com/app/sfd/cat/...7585&ts=55860# or
http://www.screwfix.com/app/sfd/cat/...9276&ts=55860# ) it
is possible to leave the central heating timer switched on all the
time and just to control boiler activity using one of these.
Horstmann or Danfoss, any comments as to which is better?



We've had the Horstmann programmer for 3 years.

It's 2 wire, & is battery powered by 2 AAA batteries.

The batteries typically last only a year (longer if you fir
Duracells), and to be honest I'd prefer a 3 wire, mains powered
programmer, as it's a pain in the butt when this unit stops operating
due to flat batteries when you don't have any spares at hand,
resulting in no heating !.

As far as functinality goes:

(Very easy to program, without reading the manual.)

You can set 4 independent temperatures values for week days (i.e.,
Mon to Fri) inclusive.

You can set 4 temperatures values for day 6 (Saturday)

You can set 4 temperatures values for day 6 (Sunday)

And, yes, you can leave your timer switched on all the time using this
programmer to control your heating.

I've no idea about the Danfoss programmer though...

Thanks to all for your replies.