You most definitely cannot fit a non return valve on the outlet from a back boiler/stoveBasically, your new back boiler is functioning just like a radiator. You can get a one-way valve fitted into the outlet pipe of your back boiler. This is like a hinged flap which opens only one way. It will allow water to flow from the back boiler out when the fire is lighting, but will prevent water flowing into it when the oil burner is on.
You most definitely cannot fit a non return valve on the outlet from a back boiler/stove
If you fit a non-return valve(one way) on the outlet pipe from the back boiler you could have a nasty incident if there is a power cut. This is a highly dangerous practice that is undertaken by installers who do not understand the working principles of dual heating system.
The back boiler will need a unrestricted primary circuit to the hot water cylinder and a seperate heating circuit linked to the oil fired boiler which can incorporate a non-return valve.
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