Yeah Title 23 says no from what I recall - must be a demand activated which is the better option anyways. The where depends on your piping system - with then exception of homerun types of systems, hook one up under the sink "The on-demand pump is generally located under the furthest sink and ties into both the hot & cold water side. Once you press the button it starts drawing water from the hot side returning it to the cold side until it senses a temperature change & it shuts off. Voilà you now have hot water at the faucet." (nothing says you cant have one in the master & also furthest, especially if no one ever uses the furthest, etc...) For more: http://thehtrc.com/2013/fix-a-leak-with-watersense-program
How to add circulation timer pump to passive recurlation system.
How to add circulation timer pump to passive recurlation system.Asked by Tom M
Currently have "passive" recirculating system. Want to add timer pump to system to speed up hot water delivery. Uses one way valve near heater. Where should the timer pump install? Eliminate one way valve? Any other "need to knows?"