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You can get a header tank in France, normally thay are a completely enclosd tank with a tapping on the top for the vent
You cannot use a conventional ballvalve due to the design of the tank
The French install woodburning equipment in sealed systems, most French contractors will refuse to install an open vented system
To install a sealed system you must have a damper on the fire combustion air supply and an indirect tank through which cold water can be passed to cool the heating circuit. Both are safety devices and are thermostatically controlled
With a UK open vent system it is imperative that the facility to dissipate heat is designed and installed in the system
With an uncontroled system, or one with inadequate allowance for heat dissipation, there is a risk of water boiling and forming steam
This may mean steam coming out of the open vent, safety valve or a blown joint. In the worst case it will mean a very big explosion as steam is a gas which is compressible
I am amazed at the number of amateurs who install these systems without really appreciating the potential danger and having the expertise to effect a correct installation. I my career in this industry I have seen, on major steam installations, immense damage done by explosions due to steam
Make sure you really know what you are doing
Le Plombier
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