New water heater "moaning"

cookncarpenterDecember 6, 2012

Recently installed an A.O. Smith 50 gal. gas w/h. When the hot water is first run at any faucet or shower in the house, a humming moaning sound, like a fog horn in the distance, comes for a just few seconds, goes away, and then several seconds later a second slightly lower pitch sort of echos the first, then goes away. This only happens rigt when hot is used after not being used for a while. Not super annoying, but concerning that something may be wrong. Hooked up exactly to same existing waterlines and gas lines as the non moaning heater it replaced.

Thank you for reporting this comment. Undo
uniflow

Just a couple of dart throws here. The noise may be expansion creaks from the line growing and rubbing across a structural member as it heats up. The hot water lines must have a little freedom to move or they will groan or snap when they are heated and again when they cool back down.

Also, water contains a certain amount of dissolved gasses(i.e., air). When the water is heated it drives them out in the form of bubbles which are released when you turn on the water. Try turning down the temp. a bit and see what happens.

    Bookmark   December 9, 2012 at 4:12AM
Sign Up to comment
More Discussions
New Water Softener problem (Fleck 5000 ProFloSXT)
Hello, I recently moved into a home that uses well...
djt511
fleck fusion high flow metered water softener
Our Culligan has died and we aint too heartbroken about...
vossner
Fleck 9100 SXT Programming/Settings
I am finally installing my new Fleck 9100 SXT!!! Thanks...
rss1978
softener is not using up salt
I have hard well water (35 gpg, 0.5ppm iron, pH 7.0,...
deepdrop
Do Electric water heaters from plumbing supply differ from home depot
Plumbers I feel rip people off when installing electric...
buddy50
Sponsored Products
St. Martin Outdoor Chaise Lounge Cushions, Patio Furniture
$533.00 | FRONTGATE
Brushed Nickel 3 Piece Rain Head Shower Set
MR Direct Sinks and Faucets
Violet Frost 18x18-Inch Silk Shantung Square Poly Insert Decorative Pillow
$113.95 | Bellacor
Crosley Firestone Square Slate Fire Pit in Black - CO9006A-BK
$169.00 | Hayneedle
Designer Flat Panel Chrome Plated Towel Radiator Rail 59 x 19.5inch
Hudson Reed
Lightolier 5" New Construction IC Recessed Housing
$44.90 | Lamps Plus
Area Rug: Flower Grande Sage 8' 6" x 11' 6"
Home Depot
Hughes Leather Corner Sectional (3 piece) - Brighton Lemon Grass Yellow
Joybird Furniture
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™