HTP – Munchkin™
How to determine the date of production/manufacture or age of HTP and Munchkin™ HVAC Systems.
The date of production/manufacture or age of HTP and Munchkin™ HVAC equipment can be determined from the serial number located on the data plate.
Parent Company: Heat Transfer Products (HTP)
Determining the version of your Munchkin Boiler
Your boiler has a plate or sticker which tells you the model number, version, and serial number of your unit.
On our site, Pre-925 denotes units built prior to 11/02/02 having a Honeywell Control. It was the first version of the Munchkin, and your serial number sticker/plate will list the model number with no version number after it. This unit was built before the 925 Controller with the digital readout. In short, if your display only has a reset button and no digital readout, you have this version.
R1 (Revision 1) denotes units built 11/02/02 – 12/19/06. Generally the sticker will show an R1 on the sticker after your model number. For example, 80M R1.
R2 (Revision 2) denotes units built after 12/20/06. Generally the sticker will show an R2 on the sticker after your model number. For example, 80M R1, or 80M ASME R2.
For wall-hung units (T50M & T80M), R1 units were built 11/02/02 – 1/3/07, and R2 units after 1/4/07.
Your serial number sticker should have the manufacture date printed right on it. The sticker is usually on the inside of the front cover.
Example serial number styles/formats found:
Style 1: Unknown
Style 1: Unknown
Unfortunately we are unable to determine the date of manufacture or age of these units. Perhaps you can assist us in our research with additional information.
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Using the ANSI or CSA standards to determine approximate Date of Manufacture.
Most manufacturers today are required to include the manufacture compliance standard on the data tag. For the U.S. the compliance standard is typically from the American National Standards Institute (ANSI). For Canada, a common standard compliance is through the Canada Standards Association Group (CSA). Many times both standards are listed. Regardless, the specific standard will normally be listed on the data tag/plate and followed by the YEAR of the last revision (often the year is placed in parenthesis or follows the hyphen after the specific standard number). As these standards are revised or renewed approximately every 4 to 6 years, one can reasonably estimate the year of manufacture within 4-6 years from (after) the standards date.
Page last updated: 2 April 2016