recirc line for a gas waterheater

robert norton

i was wondering if anyone had sketch or site for recirc line for waterheater most importantly wiring i was thinking of using a aquastat in a well with bronze pump and 832 relay thank you

Big Ed

Talk you through

Install a aquastat on the return of the recirc line and leave it on a low temp .Use a line voltage bronze circulator like the Taco 006 . Hot goes to the aquastat then to the 006 , then to ground. No relay is needed unless using dual voltage arangement .

bob young

run it continuous no aquastat cost pennies to run

hr

Try the

manufactures sites. I think Bradford White and AO Smith have piping examples for recirc.

Also look at www.contractormag.com Mark Eatherton and Dave Yates have done some articles on this, check the column archives.

hot rod

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Big Ed

Grunfos

Has anyone used, likes , dislikes or found problems with the Grunfos unit or others models that use the cross over under the sink ?

Don Walsh

HW circulator

Sorry Bob, I don't agree with your statement of "cost pennies to run." Here's why. My circulator was initially on 24/7, in the middle of the summer with no other gas appliance being used, my bills for HW averaged $75. a month. I installed a seven day time clock on the circulator to only run the pump from 5am to 7:45am when the last person left the house, then again to start running at 5pm and shut down at 10pm. Weekends had different settings, but proportionately the same run hours. Cut my average summer time water heating bill by 2/3rds. I reduced the remaining third even more after insulating all the domestic water lines in the basement with 3/4" fiberglass covering. August of this year was $18.83, same number of people, slightly higher water consumption than the preceding three year averages, and the potential (even if minimal) electric cost savings aren't factored into that either. I don't think an aquastat is the right control to use, I like the timeclock far better. Just my $.02 worth.

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bob young

target ---zero gas bill

i was saying the pump costs " pennies " to run. you have devised a suberb energy saver ,no doubt but are still comparing apples to oranges. i was simply talking of the cost of electric to run the pump besides you know us new york city guys don't care about money. lol i always used an aquastatcontrol but was advised by plumbers with more experience than me [one is 80 and one is 90 ] that i was wrong so i conceded. now if you put timers on the shower bodies maybe you can get the monthly bill down to about five bucks or less. i think you might be on to something

Mark Eatherton1

In addition to energy savings...

you will also avoid early hydrolysis erosion corrosion failure of the mains and the return lines. That in and of itself is a good reason to not let the pump run all the time. I've seen it even with 006's.

ME

Mark Wolff

Recirc pump

Taco makes 003 plumb and plug circulator in 1/2" or 3/4" ports. They have a 24 hour timer attached to the bronze body, or the new ones are available with digital 24 hr 7 day timer. They will save you money over the aquastat/pump setup, and look cleaner in the install. If you want continuous hot water, set it to run 15 min. then off 15 min. Your water will never get cold, and with the pipes insulated you could probably leave it off longer.

Larry Weingarten

recirc line sketch

Hello, Under "Hot Tech Topics" there is an article on recirc lines we wrote along with a sketch of how we suggest hooking up a recirc line if it's going to the heater. You can control this with a timer and or thermostat or go with a demand type of recirc that runs the pump, on demand, only until the water heats up at the return connection. You might want to check out the Metlund D'mand system.
Yours, Larry

Mark Chaffee

Taco's D'Mand System

The D’MAND® System is a small, silent pump attached to your hot and cold water lines in the cabinet under your most remote kitchen or bath fixture.When D’MAND® System is activated, the cool water you normally let run down the drain is circulated back to the water heater through the cold water line.

At your “demand,” the pump circulates hot water from the water heater, and returns the cooled water back through the cold water line. When the hot water arrives at the faucet, the D’MAND® System’s patented heat sensor and control board shut off the pump to prevent pumping excess hot water into the cold water line.

See attached PDF or the taco web site at

http://www.taco-hvac.com/current_category.313/prod_detail.html?Product_Group_ID=008-DM_008DMPK

for more details.

Thanks,
Mark Chaffee