P/N 472235 Rev. B 1-22-04
4
WARRANTY INFORMATION
…For the installer and operator of the MiniMax NT/TSI Low NOx pool and spa heater. The manufacturer’s warranty
may be void if, for any reason, the heater is improperly installed and/or operated. Be sure to follow the instructions
set forth in this manual. If you need any more information, or if you have any questions regarding this pool heater,
please contact Pentair Pool Products, Inc. at (800) 831-7133.
These heaters are designed for the heating of swimming pools and spas, and should never be used as space heating
boilers, general purpose water heaters, in non-stationary installations, or for the heating of salt water.
CAUTION
OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 68° F. WILL CAUSE
HARMFUL CONDENSATION AND WILL DAMAGE THE HEATER AND WILL VOID THE WARRANTY.
Do no use the heater to protect pools and spas from freezing if the final maintenance temperature desired is below
68° F, as this will cause condensation related problems.
The MiniMax NT/TSI Low NOx pool heater is sold with a limited factory warranty. Specific details are described
on the back cover of this manual and a copy of the warranty and warranty registration card are included with the
product. Return the warranty registration card after filling in the serial number from the rating plate inside the heater.
Pentair Pool Products’ high standards of excellence include a policy of continuous product improvement resulting in
your state-of-the-art heater. We reserve the right to make improvements which change the specifications of the heater
without incurring an obligation to update the current heater equipment.
PRODUCT IDENTIFICATION
To identify the heater, see rating plate on the inner front panel of the heater. There are two designators for each
heater, one is the Model Number and the other is the Heater Identification Number (HIN).
a. Model Number:
Example: 400 TSI
1
st
through 3
rd
character: Input rating (Btu/hr) X 1000
4
th
through 6
th
character: Series character, Two-Stage Ignition
b. Heater Identification Number (HIN):
The following example simplifies the identification system.
123456
RTH004TNISTHNTLAH
1) HTR : Heater
2) (200, 250, 300 or 400) : Input rating (Btu/hr) X 1000
3) NT : MiniMax NT Series
4) TSI : Series Character, Two-Stage Ignition
5) N H : Gas type (Natural gas) and ignition system (Hot Surface Ignition)
6) Options :
Blank: Standard Model
ASME: ASME Certified (Bronze Headers)
ASHI: ASME Certified Bronze Header and High Altitude Rating
HALT: High Altitude Rating
CAN: Canadian Compliance
CANH: Canadian Compliance and High Altitude
Introduction
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