Notts Posted September 15, 2014 Share Posted September 15, 2014 We have a problem with our hot water. It is a Rheem electric water heater/tank at mains pressure. Sometimes when we turn the hot water tap on (any one in the house) the pressure drops off quickly to a trickle - other times it is fine. When the pressure is low, turning the cold water on and off rapidly results in a noise from a valve near the Rheem and a return to full pressure. The problem is more likely to occur after the washing machine has been used - the rapid on/off of the cold water at the start of the cycle results in a 'clang' from a valve. We've had two plumbers look at it - one suggested a problem with the duo valve at the tank's inlet and the other a problem with the pressure limiting valve at the outlet. The second one couldn't explain why turning the cold tap on and off rapidly made a difference. Neither had seen the same problem before. Any suggestions from any experienced plumbers out there? Link to comment Share on other sites More sharing options...
Guest jak2503 Posted September 17, 2014 Share Posted September 17, 2014 [ Hi, it can only be a couple of things the banging is the duo valve, very common on the cheaper spindle type duo valves that any pressure fluctuations result in internal vibration, the best fix is to install a.quarter turn ball valve, the main issue is your mixing/temp valve, the main issue has to be there, could be just blocked or seized either way it needs to come out and be looked at, the hws is very basic in process, cold water in and hot out with only the temp mix valve in the way. QUOTE=Notts;1936605696]We have a problem with our hot water. It is a Rheem electric water heater/tank at mains pressure. Sometimes when we turn the hot water tap on (any one in the house) the pressure drops off quickly to a trickle - other times it is fine. When the pressure is low, turning the cold water on and off rapidly results in a noise from a valve near the Rheem and a return to full pressure. The problem is more likely to occur after the washing machine has been used - the rapid on/off of the cold water at the start of the cycle results in a 'clang' from a valve. We've had two plumbers look at it - one suggested a problem with the duo valve at the tank's inlet and the other a problem with the pressure limiting valve at the outlet. The second one couldn't explain why turning the cold tap on and off rapidly made a difference. Neither had seen the same problem before. Any suggestions from any experienced plumbers out there? Link to comment Share on other sites More sharing options...
DawnAndGraeme Posted October 9, 2014 Share Posted October 9, 2014 [ Hi, it can only be a couple of things the banging is the duo valve, very common on the cheaper spindle type duo valves that any pressure fluctuations result in internal vibration, the best fix is to install a.quarter turn ball valve, the main issue is your mixing/temp valve, the main issue has to be there, could be just blocked or seized either way it needs to come out and be looked at, the hws is very basic in process, cold water in and hot out with only the temp mix valve in the way. Aye what Jak said Link to comment Share on other sites More sharing options...
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