Efficient way to heat radiators and unvented cylinder

[Douglas2404]

I have a gas boiler heating radiators and also heating an unvented cylinder.

I have a Honeywell programmer which has the water heating up 1.5 hours early morning 30 mins midday and 2 hours evening

The heating is on a couple of times a day.

With the energy prices I am wanted to ask if hearing the water and hearing the radiators at the same time would save money or if would still use as much energy as running separately?

Thank you

 

[Chuck]

Unlikely to make any difference. If you really want to be sure, use a pipe thermometer to measure the temperature of the the return to the boiler in each mode. Choose the mode that gives the lower return temperature.

 

[ShaunCorbs]

Nope as you still require the same amount of power to heat both