22 mm hot water pipe comes from the boiler and is teed up for the cold
feed with 22mm pipe. The there is a Pump and it is further teed up with 15 mm for by-pass which it seems an isolator connected to Return.
The hot water has mid-position valve. One side goes to immersion tank and this has auto air trap bottle. The other side goes to heating and that is
aso teed up with 15 mm and some thing like end cap with a screw in the middle is soldered on. I suppose this is used to bleed air out on heating side. Bottle air trap is used the let the air out from th hot water side.
But definitely there is not vent pipe.
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feed with 22mm pipe. The there is a Pump and it is further teed up with 15 mm for by-pass which it seems an isolator connected to Return.
The hot water has mid-position valve. One side goes to immersion tank and this has auto air trap bottle. The other side goes to heating and that is
aso teed up with 15 mm and some thing like end cap with a screw in the middle is soldered on. I suppose this is used to bleed air out on heating side. Bottle air trap is used the let the air out from th hot water side.
But definitely there is not vent pipe.
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