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[Jcl]

Hi i need a little help.  bought my house 10 years ago it had a gas furness and a indoor wood boiler.     after 5 years the indoor boiler rotted out so i capped off the connections.     last winter i got a owb install my lines right where the indoor furness was connected.

my probem is the flow of hot water is going down into the furness and back to the heat exchanger  in stead of going up and heating the house.  indoor boiler i didnt have this problem i used the same pump as before i took a pic dont now how it will show up here but to the right of the pic you will see a green valve that's the incoming hot water from the exchanger.  water comes in and gos down. path of least resistances.    what type of valve should i install between the furness and before the t fitting?   all the check valves ive looked at have plastic in them so im thinking maybe a zone valve???  need help thanks

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[BoilerHouse]

You should be able to get all brass check valves.  I have used many of them at work and have bought the odd one from the local hardware store.

[Jcl]

thanks,  i'll look again all of the ones i've seen had plastic parts and i no they wont take the heat