S Plan programmer

[M1957]

I've got an S plan system with separate valves for the heating and hot water. Since the thermostat has a timer built in, should the main programmer (for the heating and hot water) have two channels?

I'm wondering whether it would be ok to use a single channel programmer to time the hot water and have the heating wired to the programmer's "off" terminal. i.e. when the hot water is on, heating is automatically off. Is this allowed?

 

[ianmcd]

it is "allowed" but totally daft ,just get a 2 channel programmer, they are not expensive

 

[stem]

If I were doing it, would fit a single channel timer for the hot water in place of the existing two channel programmer, connect the 'switched live wire' that currently goes out to your programmable thermostat (ie the thermostat that includes time control) to the permanent live at the programmer, and then you will have:

1) A single channel programmer only controlling the hot water 'on' time

2) A programmable thermostat controlling the time and temperature of the central heating.