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The AQ2 expansion vessel and check valve may be needed if your nearest cold water draw off from the unit is within 4ft (1.22M). Basically the expansion vessel allows for the expansion and contraction of the heated water within the tank. The check valve is set at 3.5 bar, this will reduce the incoming water pressure and also protects the water tank from any surging water pressures from your water supplier; this in-turn will help prolong the life of the tank and also serves to prevent the expanded water expanding to other cold water draw off points.
The Plumb Site has the best Water heaters at the most competitive prices. This ZIP AQ2 Expansion Vessel and Check Valve is just one of the many quality products The Plumb Site provide.
For further information contact us on 01226 288 186, or email firstname.lastname@example.org