Back boiler and emersion furnace query? I have a solid fuel parkray next to a back boiler which...

I have a solid fuel parkray next to a back boiler which I am immediately using everyday but I still have my emersion heating system switched on, if the water is anyone heated by the parkray will the emersion heater still come on or will it know that the wet is hot enough and not see in? I don't want to be paying for two sorts of gusto if I don't need to but in that are some warmer days when I don't buoyant the fire and need the emersion on. The emersion is set to grill up at night and I hold no way of shifting that, its not on a visible timer.
Many Thanks
I live contained by a Mews and am...
Answers:    HEY! u ans my quiz about beach?> where are these beach in kent>? u get any postcode or website?
many gratefulness!