Water Heater - Incomplete recirculate loop

Discussion in 'Water Heater Forum, Tanks' started by monty, Jul 30, 2013.

  1. monty

    monty New Member

    May 1, 2006
    San Francisco
    I am responsible for replacing a failing water heater at my work location - that is a pretty easy solution...take out the old State water heater and put in a new one. Simple & Done.

    However, I was looking at the installation and there is a Grundfos pump (Model UP 15-18 SU) connected to an insulated pipe that "T's" into the cold water inlet. This is a hot water return line and comes from the ceiling above our 2 bathrooms that are about 20ft from the hot water heater. The pump is not wired up at all (never has been) - so it has never been used in 15 years...There is no expansion tank (the original building plans called for one), or a temp sensor in the pipe.

    I have 1 Kitchen Sink and dishwasher that is 3 feet from the existing hot water heater location. This is a business location - Mon-Fri hours - so a timer or motion sensor in the bathrooms to trigger a recirculate pump would be the a nice thing. I don't want to spend a bunch of money updating this system, but want to see how I could get it running.

    Any help would be appreciated! - Thanks


    Attached Files:

  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington

    I have done the recirc both into the bottom of the water heater, removing the existing drain and installing a tee for the recirc,
    And I have used the incoming cold for the recirc. Normally for the incoming cold, I would have a check valve to prevent the recirc from going upstream, and add an expansion tank.

    Regardless, I use a spring check on the recirc line.

    The Aqua Stat is a nice touch on the recirc. It shuts the pump off when the heated water has completeted the loop.
  3. Sponsor

    Sponsor Paid Advertisement

Similar Threads: Water Heater
Forum Title Date
Water Heater Forum, Tanks Water Heater Connectors Leaking Apr 15, 2016
Water Heater Forum, Tanks Water heater leaking, need help Apr 14, 2016
Water Heater Forum, Tanks Water Heater Challenge Apr 11, 2016
Water Heater Forum, Tanks Most Reliable Commercial (Gas) Water Heater? Apr 10, 2016
Water Heater Forum, Tanks How do I flush my Champion Water Heater Mar 25, 2016

Share This Page