(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 10 of 10

Thread: replacing thermostat/gas valve on water heater

Hybrid View

  1. #1

    Default replacing thermostat/gas valve on water heater

    My water heater in the basement took a bath due to spring rains. The pilot wouldn't remain lit even after replacing the thormocouple so I had the whole thermostat/gas valve (propane) changed. It fired right up. But I would like to know something more.

    The old unit Unitrol had a larg red knob on top with a green cap on top with a screwdriver slot and it says main gas pressure, by which I assume that the amount of gas going to the main burner could be adjusted. The new control a bradford white doesn't have that feature. The diagram that came with it shows a "gas port" on the bottom of the unit. I looked and its something to be opened aparprently with a star screw driver. Is this a main gas pressure adjustment as on the unitrol? or is this just a place to attach a pressure gauge?

    thanks

  2. #2
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    When you say it had a bath.....
    Most water heater manufacturers specifiy that if a WH is submerged up to the level of the gas valve, it must be REPLACED. It is considered beyond repair. Too many "ifs"

  3. #3
    Plumber/Gasfitter dubldare's Avatar
    Join Date
    Sep 2005
    Location
    MN/ND
    Posts
    286

    Default

    That port is for connecting a manometer to check manifold gas pressure.


    Ditto to what jimbo said.
    --Customers of plumbers: Never be afraid to ask for proof of licensure of the plumber servicing your equipment. A licensed plumber will be proud to show you his personal license.--

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,638

    Default valve

    If everything else is working correctly then the pressure adjustment does not do anything. It is there in case the gas company's pressure increases. It does not increase the burner size it is to keep it at the proper size. Newer heaters, yours must have been ancient, have a non adjustable regulator.

  5. #5

    Default

    Thanks everyone - these comments were very helpful.

    No it's not that old - well - I guess 8 years. Don't know what I was thinking of or whether I was thinking at all. Considering the price of the valve and installation and the age of the heater I should have just thrown a new heater in. Such is life.

    For future reference - physically as far as the location of everything on the new valve as opposed to the old everything is the same. And the identification on both indicated that the main burner pressure was 10 ". So would they be considered the same as far as btu output?

    And from above - is the pressure setting in the valve essentially a protection against the supply getting higher than that? After the gas goes through the propane company's regulator is the standard pressure 10" ? (and I assume the meaning of the pressure designation is that pressure would support a column of water 10" high?)

    I find this subject very interesting. Is there a standard textbook (not too deep) anyone can recommend pertaining to such gas applications?

    Thanks again.

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,638

    Default pressure

    The secondary regulator on the LP system often is set for 13" and if your heater is labled like mine it calls for a minimum of 11" in the system so the heater's valve can reduce it to 10".

  7. #7

    Default Can my Husband install our new gas water heater

    My Husband is wanting to install our new Gas 30 gallon water heater. Where does he get a soulder ? To soulder the gas. And This old Water heater is like 13 yrs old- How hard will it be to get it out of the bathroom closet? They tell me they are so heavy becuz of all the sediment - over the last 13 yrs, so we might need a dolly. Should i be worried? Will water gush out all over the floor? How do we pervent that. Set the old water heater in a Big trash bag ? How do you keep the hot water from burning you ? I know we hook up a water hose to it - and let it run outside . Can you give me any advice? Do you buy a 30 gal Bradford White Heater, or a Sears kenmore Roto Swirl one? And ----Is a 40 gal better than a 30 gal. ? Thank you

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •