Hi,

I currently have a Siemans 2 channel programmer (1 CH 1 DHW).

Unfortunately the developer who put it in was too tight to stretch to a
room thermostat anywhere!

I want to either replace the whole thing with a wireless
thermo/programmer which will also do the DHW (or failing that add one
into the system)

any recomendations welcome!

TIA
Bax

In an earlier contribution to this discussion,
baxter basics wrote:

Hi,

I currently have a Siemans 2 channel programmer (1 CH 1 DHW).

Unfortunately the developer who put it in was too tight to stretch to
a room thermostat anywhere!

I want to either replace the whole thing with a wireless
thermo/programmer which will also do the DHW (or failing that add one
into the system)

any recomendations welcome!

TIA
Bax

Unless you need anything fancy for HW, I would just use a simple wired tank
stat for that. You probably have a wiring centre in the airing cupboard, so
it would be easy to connect it. You may already have a tank stat, anyway.
Assuming that your Siemens programmer has a built-in timer, set *that* for
when you want your HW heated. Set CH to constant, and use a programmable
stat - wireless if you like - to control when the CH comes on, and how hot
the house is to be at various times of the day. If you have TRVs on all the
radiators, you'll need to disable the one in the room where your new room
stat is to be located. The simplest way is to remove the thermostatic head
from the valve.

As for what model of stat, everyone has their favourite - but I've been
quite happy with my Honeywell CM67 (non-wireless) programmable stat. There
is, of course, a wireless equivalent - which allows you to put the switching
contacts somewhere convenient such as in the airing cupboard, and locate the
sensor module in the room of your choice.

Exactly how you wire this in will depend on what config of system you have.
I suspect it will be either a Y-Plan (with a single 3-port valve) or an
S-Plan (with two 2-port valves). See
http://content.honeywell.com/uk/homes/systems.htm for more details.
--
Cheers,
Set Square
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