Away for a week, hot water on or off?

lstar337

macman wrote: »

But it doesn't need to be on for the full seven E7 hours-the last two hours should be more than enough to heat a full tank.

I will look into getting a timer for it, I just hope the landlord doesn't notice/care.

I guess I am going to need a battery powered one, because the supply is only live during E7 hours. Any mechanical one will just lose its time when the supply goes dead.

lstar337

The timer idea might be a no-go right from square one, as I cant seem to find one that doesn't need a constant supply to keep the timer running while the E7 fuse box is de-energised.

I do have a separate supply I could use, but all the timers seem to run from the same supply they are switching.

HappyMJ

lstar337 wrote: »

The timer idea might be a no-go right from square one, as I cant seem to find one that doesn't need a constant supply to keep the timer running while the E7 fuse box is de-energised.

I do have a separate supply I could use, but all the timers seem to run from the same supply they are switching.

The timer won't save much. If the cylinder is well insulated it'll heat for the first 2 hours then switch itself off. It will only come on again in the 7 hour period if you use some hot water which is unlikely at that time of night.

lstar337

HappyMJ wrote: »

The timer won't save much. If the cylinder is well insulated it'll heat for the first 2 hours then switch itself off. It will only come on again in the 7 hour period if you use some hot water which is unlikely at that time of night.

Well tbh, that is what I thought, but others on this thread seem to think otherwise, and I always like to take on board as much advice as possible.

Cardew

Agree with HappyMJ that it won't lose much by having it on for the full 7 hours.

If it is well insulated it really shouldn't lose more than 2kWh in 24 hours with water at 65C. So even if it lost 3kWh in 24 hours that is less than a kWh a night(say 6p)

Also for much of the year that heat isn't lost as it heats the fabric of the house - a mini-storage heater!