Hot water is permanently on?

[gazwigan]

After finding that my gas bill has gone up ii have found that my hot water is permanently on and if i switch it off on the wall then it also turns off my central heating. I have lived in my house for around a year and inherited a dodgy programmer switch. Could this be the reason my gas bill is so high?

[ianmunt]

Could be the programmer,but could also be the hot water tank thermostat stuck in the on state.Does the programmer provide independent control of water and central heating?