Results 1 to 7 of 7
  1. #1
    Join Date
    Nov 2011
    Location
    Canada
    Posts
    9

    Janitrol 45K BTU Unit Heater: H-Exchanger or Equivalently Dimensioned Replacement Htr

    My home shop is heated by a compact mid-60's 45k BTU Janitrol unit heater
    (15" wide x 24" tall x 24" deep.) There is a crack in the heat exchanger. I
    understand that Janitrol left the playing field long ago and factory parts are
    NLA.

    • Is there an aftermarket source for a replacement Janitrol heat exchanger?
    • Is there a replacement unit heater with similar physical dimensions to
      my Janitrol?

    This heater is surrounded on four sides. It vents into an adjacent chimney
    flue that is shared with 3 furnaces and a hot water heater in the attached
    home. Circumstances in the shop mean that switching to a horizontal
    style unit heater is undesirable.

    I have been unable to locate a suitable replacement after looking at products
    offered by

    Carrier, Lennox, Modine, Mr Heater, Reznor & Trane
    Amongst these mfrs, only Reznor offered a vertically oriented heater in a 45K
    capacity, the Reznor Model F (14" W x 30" T x 32" D). Unfortunately, its height
    and depth are too large for the available space constraints.

    I am working on a method to get a good view of the ID plate on the back
    of the heater so as to collect model and serial numbers. In the interim,
    here are photos:





    .

  2. #2
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,731
    modine might have one

  3. #3
    Join Date
    Nov 2011
    Location
    Canada
    Posts
    9
    Quote Originally Posted by catmanacman View Post
    modine might have one
    Any additional details will be welcomed.

    AFAIK, the Modine PDP High Efficiency (powered vent & intermittant pilot)
    series of commercial gas heaters are the only vertical (portrait) style offered
    by Modine currently. The entry point for this series seems to start now at
    150k BTU.

    I see smaller output versions of Modine's PDP (30 to 125k BTU) and also a
    full line of the PD (gravity vent & standing pilot) on pg 5 of their April 2005
    catalog #75-136.37
    . But there are statements on vendor sites that say the
    PD has been discontinued and the PDP starts at 150k.

    Is this correct? If so, I wonder what the prospects are for finding an
    new-old-stock PD 50?

    Dimensions given on pg 12 of the Installation and Service Manual for the
    PD series are quite close to the Janitrol, there's a good chance the extra
    width can be accomodated in the available space.

    17-1/4" wide (A) x 24-1/4" tall (B) x 20-1/8" deep (LL)

    As I understand it, the standing pilot and gravity vent would permit the
    Modine BP to be used with the existing venting in place for the Janitrol.

    (I am under the impression that the intermittant pilot and power vent of
    the Modine BDP would require revisions to the existing vent to the shared
    chimney - this is a drawback.)

    .

  4. #4
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,731
    have you looked at infrared hanging heaters they are ventless .it might be time to call in a hvac contractor to get one and install it for you

  5. #5
    Join Date
    Nov 2011
    Location
    Canada
    Posts
    9
    Quote Originally Posted by catmanacman View Post
    Have you looked at infrared hanging heaters they are ventless.
    I am aware of them but know very little about them. They heat objects
    whereas unit heaters heat air. I thought they had to be vented, what
    happens to the combustion gases?

    Quote Originally Posted by catmanacman
    It might be time to call in a hvac contractor ...
    Perhaps my earlier remark about "statements on vendor sites" suggests
    that I am shopping with the intent of doing my own work, this is not the
    case. One contractor has been on site, I have spoken to and visited two
    others.

    I WANT the work done by professionals. It is just that so far, firms have
    been trying to sell me what they carry instead of trying to help solve my
    problem. Today I'll be calling local firms that carry Modine heaters, so
    maybe there will be a change for the better.

    .

  6. #6
    Join Date
    Nov 2011
    Location
    Canada
    Posts
    9
    Quote Originally Posted by EddyCurr View Post
    Quote Originally Posted by catmanacman
    Have you looked at infrared hanging heaters they are ventless.
    I am aware of them but know very little about them. They heat objects
    whereas unit heaters heat air. I thought they had to be vented, what
    happens to the combustion gases?
    After some reading, a 'ventless' infrared heater seems an odd recommendation
    for use in an enclosed inhabited space like a shop. Dayton recommends
    that there be '4 cfm of exhaust ventilation for every 1000 BTU of infrared
    heat.' That would appear to call for 200 cfm in the case of a 50k BTU
    installation ?

    This matter aside, the 9' ceilings in my shop are too low. Vented tube
    and ventless ceramic infrared heaters both appear to require ceilings of
    14' + for effective operation.

    No luck yet on locating an NOS Modine PD 50 unit heater. Nor any luck
    on locating other alternate heaters to fit within the available space.

    .

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,316
    Sterling has a 45K at 14" wide 27" high 30" deep if that might work.

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