antonyupward
New Member
Hi,
Didn't want to post to the other current thread on tankless recirculation because I have a slightly different situation / idea
I have a instant-on domestic hot water boiler (NTI Trinity T200). The flow switch to trigger the boiler requires at least 1/2 GPM flow.
I have installed the Grundos Comfort System Recirculation System - which uses the cold lines as the "return" lines through a heat sensitive "comfort valve" valve installed between the hot and cold supply pipes at the furthest sink.
I knew this pump wasn't designed for an instant on situation - but thought it was worth a try.
Suffice to say it didn't work. At first I thought it was because the flow wasn't high enough to trigger the boiler. So I installed a relay triggered by the pump which tells the boiler there is a demand for hot water.
But, unfortunately, it appears the pump isn't powerful enough to move the water in the pipes (perhaps because my domestic water pressure is >60psi (60 is the top of the pressure gauge's scale?).
So now I've been trying to find advice on a more powerful pump.
The problem is that once the value closes as hot water reaches it, the pump continues to operate until the timer turns it off - i.e. by design no water can move. I understand that this requires a special pump design to avoid over heating and damage to the pump.
Can anyone recommend how I can figure out a suitable pump?
Thanks
P.S. I'd be interested in *ANY* recommendations for retrofitting recirculation systems (i.e. no dedicated return), where no power is required at the sinks.
Didn't want to post to the other current thread on tankless recirculation because I have a slightly different situation / idea
I have a instant-on domestic hot water boiler (NTI Trinity T200). The flow switch to trigger the boiler requires at least 1/2 GPM flow.
I have installed the Grundos Comfort System Recirculation System - which uses the cold lines as the "return" lines through a heat sensitive "comfort valve" valve installed between the hot and cold supply pipes at the furthest sink.
I knew this pump wasn't designed for an instant on situation - but thought it was worth a try.
Suffice to say it didn't work. At first I thought it was because the flow wasn't high enough to trigger the boiler. So I installed a relay triggered by the pump which tells the boiler there is a demand for hot water.
But, unfortunately, it appears the pump isn't powerful enough to move the water in the pipes (perhaps because my domestic water pressure is >60psi (60 is the top of the pressure gauge's scale?).
So now I've been trying to find advice on a more powerful pump.
The problem is that once the value closes as hot water reaches it, the pump continues to operate until the timer turns it off - i.e. by design no water can move. I understand that this requires a special pump design to avoid over heating and damage to the pump.
Can anyone recommend how I can figure out a suitable pump?
Thanks
P.S. I'd be interested in *ANY* recommendations for retrofitting recirculation systems (i.e. no dedicated return), where no power is required at the sinks.