Welcome to Plbg.com
Thank you to all the plumbing professionals who offer their advice and expertise

Over 687,000 strictly plumbing related posts

Welcome to Plbg.com the PlumbingForum.com. We are the best online (strictly) PLUMBING advice, help, dyi, educational, and informational plumbing forum. Questions and discussions about toilets, sinks, faucets, drainage, venting, water heating, showers, pumps, and other exclusively PLUMBING related issues. Please refrain from asking or discussing legal questions, pricing, where to purchase a product, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups. We do not sell your information. We are made possible by:  

Post New
Log In
How to Show Images
Newest Subjects
 Watt recirculating pump installation question
Author: situationiste (CO)

If I trip the breaker and shut off cold water into the water heater and open a faucet to drain the heater about halfway down, why would I need to drain the whole heater as the instructions say to do? For that matter, if the water level in the heater were an inch below the top, wouldn't that work?

Post Reply

 Re: Watt recirculating pump installation question
Author: Curly (CA)

If this is the Watts pump that mounts to the hot side outlet nipple you are correct.

Turn off the breaker, open a faucet to relieve pressure, loosen hot side connection at top of water heater and bleed out water till it stops and install pump.

Fill heater with water, bleed all the air out through the hot side on a faucet, turn power back on and set timer on pump.

Post Reply

 Re: Watt recirculating pump installation question clap
Author: situationiste (CO)


Edited 1 times.

Post Reply

 Re: Watt recirculating pump installation question
Author: packy (MA)

most installations require the removal of the drain valve at the bottom of the tank and installing a tee before re-installing that drain valve . the pump pushes the returning circulated water into the bottom of the tank.

Post Reply

 Re: Watt recirculating pump installation question
Author: Curly (CA)

Hi Packy,

I believe this is the system that he has ....


Grundfos makes it and Watts sticks there name on and it sells through the orange big box.

It is a non-traditional recir system (no loop) and uses the manifold installed at the farthest sink away from heater etc. No tie in back to the heater.

In my neck of the woods the city is giving the Watts branded model away to homeowners to save water.

Post Reply

 Re: Watt recirculating pump installation question
Author: NoHub (MA)

We can't use those in Massachusetts, have to go back with a recirc-line like Packy said.can't use thermostatic tees. It can cause a cross connection. I can post the link to the mass approval sight if anyone needs to see it. (Yea I know Massachusetts is nuts)

Post Reply

 Re: Watt recirculating pump installation question
Author: bernabeu (SC)

It can NOT 'cause' a cross connection


it IS, in and of itself, a cross connection.

.... and, IMO, SHOULD be prohibitted

- - - -

Retired U.A. Local 1 & 638
"Measure Twice & Cut Once"

Post Reply

Please note:
  • Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
  • Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
  • Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
  • Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:

Special thanks to our sponsor:

Copyright© 2023 Plbg.com. All Rights Reserved.