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OK 10:4 on abv I will put in t across the coil... If I try the combining as suggested above I will still have the vent after the pump but I am assuming that the combined now has the feed pressure from the header tank therefore more resistance than before and hopefully the flow will not be up the vent.(unless of course it needs to)
Again appreciating the help..
No, what the combined feed and vent will mean is that there is no path for the water to flow and return. Because you have effectively one single pipe used as a feed & with a vent teed off it, then for the water to flow up it has no path of return, if you know what I mean.
The way yours is done will mean the water goes up the vent & the displaced water is replaced from the heating tank down the feed, - basically like a radiator.
The point above about the position of vent on end of tee is an interesting one, but if the water has an easy route it will take it on a twin feed & vent set up, no matter how you tee off.
Tbh, I do not like the combined feed & vent as I know plenty of jobs suffer from magnetite on those systems. The close coupled arrangement is perhaps better, but I also think it is not that good & I know air can be an issue.
Sealed system is the way to do it. If the pipe work seems sound I would go that method, but plastic push fit is a worry. The extra pressure is not huge - system only needs a max of 1 bar usually with oil boiler
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