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How do you adjust a water heater timer?

(7 Posts)
kardashianklone Fri 25-Nov-16 15:46:08

Does anyone know how to adjust water heater timers? I used to have hot water for 7am and 7pm, but (I think this is the cause) since the clocks when back, now I don't seem to have hot water at all. There are two, one for 'day' and one for 'night' but I'm baffled but the two different dials within themselves. How do you know which one to turn and which way? The numbers seem to have no correlation to timings. And how far in advance do you need to tell it to start heating water up? If you want it for 7am, do you need it to start heating at 6pm or does it take more than an hour. Thank you!

LIZS Fri 25-Nov-16 15:53:57

Have n't you got it set to only come on in the evenings? Midnight to 7am on first dial, 7:30 to 10:00pm on second. The arrow should line up with current time, but they seem to differ.

Spam88 Fri 25-Nov-16 15:59:19

Not quite sure what the two separate dials are for, but I agree with what the poster above said.

Do you have a storage tank? I heat water from 6:30-7am and have my shower around 7:15.

PigletJohn Fri 25-Nov-16 16:54:35

Do you have an economy 7 or similar night-time electricity tariff?

If so, please show the cables and boxes around your electricity meter, and the face of the meter.

What colour and size is your hot water cylinder?

Do you have a gas boiler?

PigletJohn Fri 25-Nov-16 16:57:22


The arrow on the housing should point to "current time" on the wheel. Rotate the wheel, in the direction of the arrows shown on the wheel, until it does.

kardashianklone Fri 25-Nov-16 19:56:22

I'm on economy 7. There are two dials, the top one is night, the bottom is day. I've tried the shower this evening and there is hot water from 7pm but there wasn't this morning at 7am .

PigletJohn Fri 25-Nov-16 20:27:29

The "night" timing needs to have the clock wheel set to correct time, because it is possible that it will only warm the cylinder during the off-peak hours. A picture round your electricity meter would help, because there may be an off-peak timer as well.

It would be best to heat the cylinder to the maximum using the off-peak supply, because it will be about half the price of daytime electricity. You have a white, unvented cylinder, which can give very good flow. It is very well insulated, so if you can fully heat it offpeak, you may not need to use the daytime electricity supply. For economy, set it to "off" and only begin to use it if you find the water heated overnight is insufficient.

I don't know the size of your cylinder, but it will probably take at least two hours to fully heat. Once it reaches temperature, the thermostat will switch off the electricity. So it is most economical to set the offpeak timer to be on for at least two hours, preferably more, during the offpeak period. Depending how many showers you have in a day, it may be all you need until the next night's heating period. The insulation means you will not lose any significant heat from leakage during the day.

BTW there appears to be a rust stain from a small leak on the front of the cylinder, so you should have it serviced by a qualified person. Not all plumbers are qualified to work on unvented cylinders.

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