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  1. #1
    Join Date
    Oct 2008
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    Default Steam Radiator Individual Thermostat

    There is a video on TOH which shows how you can replace the vent of a radiator with a thermostat that shuts the individual radiator off when the preset temperature is reached.

    They used to have comments which identified the make of the thermostat, but they are gone.

    All I can find seem to be ones that attach to the valve, if I am not mistaken, and I am not sure those are as simple to install.

    I have a single pipe steam radiator. Any suggestions?

    You can find this stuff everywhere in Europe, here the you need to go to specialty stores to dig them up!

  2. #2
    Join Date
    Feb 2008
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    556

    Default Re: Steam Radiator Individual Thermostat

    I recall most of the episode---if it's the same one you're thinking of.

    Trethewey, the Master Plumber for TOH installed what's called a Thermostatic Radiator Valve (TRV) on the vent section of a one-pipe steam radiator.

    These valves require no electricity & have a temperature control that's part of the valve---they are made by Honeywell, Danfoss & others.

    As I recall, Trethewey installed a "right angle" version of the TRV using teflon tape, then re-installed the air vent on the outlet end of the TRV.

    If you want to install it yourself, I've seen them for $29-$40 on-line at www.pexsupply.com; and also at www.patriot-supply.com.

    Enter "thermostatic radiator valve" into their search box--if the local price is about the same, you'll get a lot more free help & advice from the counterman where you buy it at a plumbing supply house in your area.

    For more info:

    Google "thermostatic radiator
    valve""steam radiators".
    Google: "how to install a radiator thermostat"
    Google: "How to maintain a steam radiator"

    Since they cost ~$40-50 each plus installation costs, it's best to check out why the radiator is not performing as wanted without the expense of having a TRV installed.

    Updating the controls & components already on the radiator usually solves most problems encountered.

    http://www.thisoldhouse.com/toh/vide...638722,00.html
    Last edited by NashuaTech; 11-23-2008 at 03:30 PM.

  3. #3
    Join Date
    Oct 2008
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    12

    Default Re: Steam Radiator Individual Thermostat

    Hi, thanks for the extensive reply.

    However, I have gone through both Danfoss and Honeywell, and every entry I have found refers to a 2-pipe steam system. Moreover, you get entries for valves, but what I am looking for is just a thermostat applied to an individual radiator, with no thermostat control for the room. Just a self-standing unit, which applied to the vent, and shuts the radiator off once a certain temperature is reached.

    The radiator is working just fine. The only problem is, I live in a rental, on the top floor, and my apt gets really hot, over 82 degrees, so I either have to turn the radiators off in individual rooms or open the windows. The latter is very inefficient, the former means I have to keep on doing this every time it gets too hot or too cold.

    This stuff is really simple. You should just screw it on the vent side, set the temperature, and that's it.

    Problem is I can't find it, Honeywell don't reply, and I don't have a good plumbing store close to where I live.

    PS: I have now found these:

    http://www.statesupply.com/displayItem.do?sku=DC1020

    http://dticorp.com/catalog/honeywell...ve-p-2826.html

    The term seems to be: "non-electric built-in thermostat operator".

    But the Danfoss is for a 2-pipe, and the Honeywell is for the valve side, not the vent side.
    Last edited by DeborahB; 11-24-2008 at 05:56 PM.

  4. #4
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
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    5,843

    Default Re: Steam Radiator Individual Thermostat

    It has to be on the valve to shut the steam off or it wouldn't control the temperature.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  5. #5
    Join Date
    Jan 2008
    Posts
    731

    Default Re: Steam Radiator Individual Thermostat

    Quote Originally Posted by DeborahB View Post
    There is a video on TOH which shows how you can replace the vent of a radiator with a thermostat that shuts the individual radiator off when the preset temperature is reached.

    They used to have comments which identified the make of the thermostat, but they are gone.

    All I can find seem to be ones that attach to the valve, if I am not mistaken, and I am not sure those are as simple to install.

    I have a single pipe steam radiator. Any suggestions?

    You can find this stuff everywhere in Europe, here the you need to go to specialty stores to dig them up!
    Quote Originally Posted by JLMCDANIEL View Post
    It has to be on the valve to shut the steam off or it wouldn't control the temperature.
    Jack
    Nope. on a one-pipe steam system the TRV goes between the air vent and the radiator becaue you can't throttle the inlet valve on a one-pipe steam radiator (if it is a two-pipe system the TRV replaces the radiator's supply valve), according to Dan Holohan.

    He also mentions that you can cover the radiator with a heavy-cloth bag (like canvas) that you make up similar to a pillow case you can even make a gusset and a draw string so you can raise and lower the bag like a curtain or close it at the bottom. The bag cover cuts down on the convective currents and effectively undersizes the radiator.

  6. #6
    Join Date
    Jan 2008
    Posts
    731

    Default Re: Steam Radiator Individual Thermostat

    p.s. hope this helps

    i think he might have installed the Danfoss Radiator Thermostat RA2000 mounting operator with built-in sensor. this is the instructions http://na.heating.danfoss.com/PCMPDF...2_standard.pdf

    but i recall his talking about wax and mercury on some show not sure which one, and mercury is all phased out on hvac residential so not sure if it might have been a phased out control model.

    this is the ATOH show where they installed the Danfoss http://www.thisoldhouse.com/toh/tv/a...1662_709282,00

    The show description gives the name of a particular sales manager and contact info but since their web link on the page is bad it might be outdated. I think it should be: http://www.danfoss.com/North_America/ but I don't know where you are, so here is a link to their many offices in the US: http://www.danfoss.com/Contact/World...Map&Country=US and the main hydronic heating office in north america is in canada. the web site is: http://www.na.heating.danfoss.com/

    the north america technical support number is 1-866-375-4822. mabe they can get you in touch with your sales rep and a dealer/retailer. if you're elsewhere in the world try the world wide map on their site to find your best contact.

    I might have been thinking about the wax and mercury discussion when Rich replaced the air vent on a single pipe steam radiator and fixed the leaking valve on this show: http://www.thisoldhouse.com/toh/tv/a...516206,00.html

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