Solid fuel back boiler

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We got an open fireplace with a back Boiler it also feeds the radiators with a pump, the water goes via the back boiler through a coil under a hot water cylinder heating the hot water. My question is, if the hot water would be connected to a pump EG pumping the water passed the back boiler through the coil would it increase the efficiency of heating the hot water on the cylinder in the summer when not using the heating?

I was thinking that because the oil boiler attached to the system when switched on uses a pump to move the water around from the boiler in the garage to the coil in the cylinder to heat it, in case of open fire the water comes first from the back boiler into the coil via pipes it then can heat the water in the cylinder, so I was thinking getting water quicker to the cylinder would speed it up getting water in cylinder hot.
 
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Have a look at loading valves- a normal pump (without some carefully placed pipe thermostats) will cause condensation on the outside of the back boiler and rot it.
If the pipe runs from back boiler to cylinder are the minimum 28mm and mostly vertical you won't gain a lot with a pump.
Also be very careful messing with the system- any blockage between back boiler and header/vent pipes could have explosive consequences.
 
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Have a look at loading valves- a normal pump (without some carefully placed pipe thermostats) will cause condensation on the outside of the back boiler and rot it.
If the pipe runs from back boiler to cylinder are the minimum 28mm and mostly vertical you won't gain a lot with a pump.
Also be very careful messing with the system- any blockage between back boiler and header/vent pipes could have explosive consequences.
Ours come out horizontal from the back boiler and stay that way when going into the coil on the bottom of the hot water cylinder and come out again horizontal and go vertical for short way and return horizontal to the back boiler. there is of course a thermostat but that starts the heating pump/radiator pump. Just trying to get the hot water to get up in the cylinder quicker in the summer lol, heating is fine in the winter.
 
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With that setup a loading valve will work very well. And prevent heat loss from the cylinder back to the back boiler when the fire isn't lit.
If you do fit one, pay attention to the system drawings re the feed and expansion pipes (to avoid creating a steam powered bomb if the power goes off)
 

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