Hello

My first post, hello everybody. Have just purchased a doer upper in the BOP and first up is the heating - need to get something set up for winter.

Currently has a woodburner with wetback, directly heating the HWC. Low pressure, open vented, no pump, works perfect.

It is my wish to add 2 or 3 radiators to this system, but as it is direct (no heat exchanger in the HWC) i am faced with the challenge of keeping the two mediums separate, as i do not wish to drink radiator water!

current ideas are:

an extra wetback coil in the wood burner and independent radiator circuit

OR

heating either the radiator circuit or the HWC indirectly, with a heat exchanger. The easiest solution for me would be to send the water from the wetaback to a heat exchanger and one heat sink rad, and pipe the domestic hot water around the heat exchanger to heat it up. Would this work? i could then possibly add another 2 radiators on a pumped circuit etc etc.

My main question is, would the heat exchanger and heatsink rad from the wetback be enough to heat the hot water, and what type of heat exchanger should i aim for?

I am aware of having to open vent the new circuit and include a header tank etc etc

Thanks!