01:37PM | 11/09/04
Member Since: 11/08/04
2 lifetime posts
Recently, I started hearing "knocking" sounds from the water heater vent. It only happens when hot water is being used somewhere in the household. Is that something I should be concerned about? Thanks.


05:32PM | 11/09/04
Generally noise from the water heater are not a concern after you identify what is causing them. Up high by the vent the knocking is usually from back flow nipples. These have balls in them that prevent the hot water from backing into the piping. You may or may not have them depending on the make and model. You can put your hands on the silver nipples and feel the knock. This sound will occur whether the burner is on or not. It's the flow of water.

The most common source of knocking noise is gas bubbles coming up through the sediment on the bottom of the tank. This would occur after the burner has been on for a couple of minutes and may continue after the burner goes out. Knocking may also occur when cold water hits the hot in the tank. This happens if your dip tube has gone out.


11:02PM | 02/11/14
Member Since: 02/11/14
1 lifetime posts
I have purchased a new home and every time the hot water kicks on, I get knocking coming from the flue/ chimney of the hot water heater. My builder is telling me that it is a natural occurance with the flue/ chimney heating up and colling down that causes the knocking. I can understand that since the knocking occurs after the water heater (Gas) starts heating, and stops 10-15 minutes after the water heater stops heating. ( I assume the cool down period). This is my 15th house and I have never heard this before. Is this correct that it is the ventilation/ flue material heating and cooling, if so, why has it never happend in any other house, and how do I stop it? Change flue/ chimney material? It is so loud that it will wakse you up from a dead sleep because the chimney goes behind the wall in the master bedroom.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

The “Briolette” faceted glass sink from Kohler measures 17.5” wide and is sure to catch the eye—as it does the light. $707.50 Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... For some decorative recycling, consider burying old bottles upside down to create edging for your garden beds and walkways... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon