Plumbing

Plumbing Questions? Ask a Plumber and Get Answers ASAP.

Ask an Expert,
Get an Answer ASAP!

Plumbing

I want to replace two hot water heaters with one in my ranch

Customer Question
Hi Mark, I want to...
Hi Mark, I want to replace two hot water heaters with one in my ranch style home with crawlspace. I have a 40gal tank in a newer addition laundry room for the main/single tank, and I will remove a natural gas lowboy heater in a crawlspace in the older part of the house. Here's my (rough) plan:
- purchase a Grundfos Pump; looking at a model with built in check valve and temperature sensor (I do not need or want a timer) My supply lines at the tank are 3/4" but I don't see where Grundfos makes a 3/4" FNPT pump, only 1/2 and 1 1/2", so I will need to install adapters.
- pump will be mounted on top of the heater at the hot water outlet, temp sensor attached to hot water line.
- I will install a 1/2" pex return line in the crawlspace and connect it to the farthest hot water supply line/fixture (connected to the hot water line, not the cold water line, correct?)
- Connect the 1/2" return line directly to the drain valve on the water heater. With this connection I do not need a check valve or expansion tank on this line, correct ??
With this system and model of pump I should see the pump kick on an off depending on the temperature sensor reading, and be able to receive hot water at all fixtures in a reasonable amount of time. I note that I am on a well and not all that concerned about losing water down the drain. Thanks,
Dave, Colorado Springs, CO
Submitted: 2 years ago.Category: Plumbing
Show More
Show Less
Ask Your Own Plumbing Question
Answered in 8 minutes by:
11/20/2015
Plumber: Rick, Construction Supervisor replied 2 years ago
Rick
Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 23,079
Experience: Licensed Master plumber with 40+ yrs. experience.
Verified

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can

continue our conversation.

You want to install the pump on the return at the bottom of the tank not at the top of the tank. All you need is a 1/2" return line. That's why Grundfos only makes a 1/2" pump. You also want to remove the tank drain, install a 3/4" brass nipple then screw on a 3/4" X 1/2" brass TEE. Your drain goes into the end of the TEE your return into the 1/2" branch. If your pump has a built in check you don't need another one. An expansion tank is only necessary if you have problems with the temp & pressure relief valve discharging. You can install the expansion tank (if you need one) on the cold water line near the tank.

Ask Your Own Plumbing Question
Customer reply replied 2 years ago
install the pump on the return at the bottom of the tank". Isn't it better to pull water from the top than pushing it all the way through the tank?
Plumber: Rick, Construction Supervisor replied 2 years ago

The return pump always goes on the return line at the bottom of the tank in a case like yours. You're only moving enough water to keep the water in the line hot. Why do you suppose Grundfos only makes a 1/2" return pump when every water heater has 3/4" inlet and outlet connections. Your plan can work except that you're significantly reducing the hot water flow to the fixtures by reducing to 1/2" to accommodate your pump. Stick with the config that's standard practice.

Ask Your Own Plumbing Question
Ask Rick Your Own Question
Rick
Rick
Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 23,079
23,079 Satisfied Customers
Experience: Licensed Master plumber with 40+ yrs. experience.

Rick is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Marc

Marc

Plumber

1,127 satisfied customers

Plumbing heating & home maintenance contractor

Jerry

Jerry

Plumber

784 satisfied customers

over 20 years residential plumbing experience.

Theplumber717

Theplumber717

Plumber, Hvac Tech

656 satisfied customers

Lic Plumbing contractor, 28/yrs res,com,repair,Universal HVAC Tech

Phil

Phil

Mechanical Engineer.

610 satisfied customers

Retired mech. contractor, shop owner, 51 yrs experience.

Mario

Mario

Master Plumber

604 satisfied customers

Master Plumber, Fire Sprinkler, and Jobbing Spec.

Bud

Bud

Plumber

538 satisfied customers

22 Years Field Experience - 17 Years Business Ownership - Residential or Light Commercial

Rick Mather

Rick Mather

Building Inspector

498 satisfied customers

Assistant Building Official, HVAC Tech

< Previous | Next >

Related Plumbing Questions
I live in a community of 10 duplexes. The landlord said
I live in a community of 10 duplexes. The landlord said there was only one shutoff to all of them. I wanted to change the kitchen faucet but the shutoffs under the sink do not shut off the water. Can … read more
Rick
Rick
Construction Supervisor
23,079 satisfied customers
I have a R. I have a Rinnai hot water system with a
I have a Rinnai hot water system with a recirculation pump, I cannot seem to understand the directions for programming it so we get hot water when we want it.. … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
GE water softener issues. Control panel flashing 14 days to
GE water softener issues. Control panel flashing 14 days to empty. Blue light flashing. Cannot reset panel Correct time is shown, however. Model GXSF30V … read more
Cole
Cole
Sales/Purchasing/Support Manager
High School or GED
22 satisfied customers
The other day, ran the garbage disposal and both sides of
The other day, ran the garbage disposal and both sides of the sink began to fill up and would not drain. Without realizing the exact problem, we ran the dish washer and the clothes washer. Water began… read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
Heater won't go above 110*F. Since this morning. Depends.
Depends. I'm a plumbing contractor. I've done some work on Noritz heaters before but not a lot. … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
In the morning when my toilet fills there is spurting. It
In the morning when my toilet fills there is spurting. It sounds like that is air in the lines. The issue started after an diswasher installer turned off my water. I would expect there to be air in th… read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
My tankless water heaters ran out of propane, then when I
my tankless water heaters ran out of propane, then when I got a delivery I cannot get it to reset and work … read more
Brian Weeks
Brian Weeks
71 satisfied customers
I am trying to replace hose for k-10433-bn spray hose. How
I am trying to replace hose for k-10433-bn spray hose. How do i get old part out? … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
How is a Moen Bathroom 2 handle faucet disassembled.
How is a Moen Bathroom 2 handle faucet disassembled. unscrewing the part under the handle clockwise ?? … read more
Rick
Rick
Construction Supervisor
23,079 satisfied customers
Our rinnai water heater has a code 61 problem. Combustion
Our rinnai water heater has a code 61 problem. Combustion failure. Curious about what that entails … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
I installed Rheem RTG95 DVLN tankless water heater. System
I installed Rheem RTG95 DVLN tankless water heater. System starts then shuts off after air purg and goes into code 12. ( code 12 gas service interrupted). Checked with local gas company as manual sugg… read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
I have 2 rianni systems that are not producing hot water.
I have 2 rianni systems that are not producing hot water. … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
We just got a one piece Kohler toilet installed, didn't
Hi, we just got a one piece Kohler toilet installed, didn't tighten down too much … read more
Brian Weeks
Brian Weeks
71 satisfied customers
Have a ge water softener water is building up in the unit. 3
have a ge water softener water is building up in the unit … read more
Rick
Rick
Construction Supervisor
23,079 satisfied customers
I replaced the stems in my Roman tub handles and now the
Hi, I replaced the stems in my Roman tub handles and now the water won't turn off. … read more
Brian Weeks
Brian Weeks
71 satisfied customers
We have been away 4 days and came back to find our Rinnai
We have been away 4 days and came back to find our Rinnai tankless hot water heater alarm going off. The water temp is down to 65. Our tankless hot water heater is located on the outside of our house.… read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
Is it possible to convert a Kohler touchless toilet to a
Is it possible to convert a Kohler touchless toilet to a manual flush … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,353 satisfied customers
Our tankless water heater works half the time, does not work
Our tankless water heater works half the time, does not work half the time. Perhaps an hour after there is no hot water, we turn it on and there is hot waer. What can we do? This is a Country Inn and … read more
canuck the pro
canuck the pro
251 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x