Discuss 10 litre unvented undersink heater in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Thanks, they usually come with a single I think? Have one that hasn't come with a check valve.
Yes I no the need for one, was just wondering if it was specific which type was used.
Thanks it just say check valve no mention of single or double
Do you always use doubles on small unvented heaters is only 10 litres?
No need for 1, the water expands back into the cold
Only when pressure is above 5.5 bar so don't fit them eiver
Reply to 10 litre unvented undersink heater in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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