Return to the Plumbing Forum | Post a Follow-Up

 o
Point-of-use water heater supply line: in-line hot or cold?

Posted by jlcjlr (My Page) on
Sun, Sep 4, 11 at 14:08

Our 40 year old electric water heater finally died. We had an on-demand gas heater installed and saved $100 on the electric bill our fist full month of operation! However, due to the gas meter location and other considerations the delay to get hot-water in the kitchen is nearly 3 gallons and over 2 minutes. I think the best solution is to install an electric point-of-use 6 gallon tank under the sink. Should the supply be cold or hot from the on-demand?


Follow-Up Postings:

 o
RE: Point-of-use water heater supply line: in-line hot or cold?

I have a similar situation with my master bath about 60 feet from the water heater. I am considering putting a small hot water tank in the basement right under the bathroom, but am not sure if it is practical. Water cost is not an issue being on a well. The question is is saving a 2 -3 minute wait worth the price of the heater and cost to operate it? As far as water supply to the small heater is concerened, it seems that the hot line would be better because there is less temperature rise needed and if you deplete the small tank supply, you will still get hot water from the main on demand heater. Good luck!


 o
RE: Point-of-use water heater supply line: in-line hot or cold?

These are typically very different situations. Kitchen use is typically smaller amounts at-a-time. Even dishwashers -- the newer ones -- don't use very much water. Master bath use is typically greater quantities -- like showers you don't want to get cold in the middle of.

However, seems to me a recirculation device would likely be most cost effective and convenient solution for both applications.


 o
RE: Point-of-use water heater supply line: in-line hot or cold?

I think in your case, supply line hot would be the only option. For us, the old water heater was in the kitchen so we just transfered the wait time from the kitchen to the bathroom. We're having a tough time changing our water use habits. Prior to the new on-demand, turning on the shower and waiting seemed part of the routine. For handwashing after a potty stop, you knew to turn on the water when you entered! Now, in the kitchen the wait seems so long. A quick rince of dishes or a handwash doesn't seem worth the wait so everything but washing dishes is in cold water. I'm trying to figure out if the few times we need unlimited hot water (hot supply line) is worth paying for heating a small amount of hot water to sit in the pipes each time you use less than 3 gallons in the kitchen. I'm really leaning towards the cold supply line and seeing if 6 gallons will meet our needs. A dishwasher, which we do NOT currently own, uses 5-6. I've heard that hand washing wastes more water but I need to actually measure. Then the consideration is the cost. We thought we were going to heat water with gas and now are considering electric for the kitchen.

I'll post what we finally decide to do.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Plumbing Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here