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Hot water recirculation do they save money?
I have done some research on this topic and their seems that some people agree it does save money do the fact your not wasting water, other seem to think your wasting energy because the system is keep the water a certain temp. I got one installed and did not want it installed but their was confusing of the options that were presented. I have noticed that when I shut down the recirulation pump the water temp jumps up to 140 degree and then quickly goes back down to 120. With the pump on the water instant at 99 degrees and never jumps over 120. My DHW is a navien ch240 that is set to 120 for DHW. My concern is that I spending more money just to have instant hot water. I know it's better than heating 50 gallons..
I have also heard that these systems cause Corrosion-erosion within the copper pipes has anyone experience such an issue?