PENTAIR 472100 MiniMax NT Pool Spa Heater Digital Display Temp Control w/Overlay. Used in Excellent Working Condition. Pentair 472100 Digital Display Temperature Controller Board Replacement MiniMax NT Series Pool and Spa Heater. EChecks must clear before item(s) are released. Tracking information will be available upon request. We do our best to ensure the accuracy of every listings. Unfortunately, do to our high volume, mistakes sometimes occur. Get images that make Supersized seem small. Showcase your items with Auctiva’s. Track Page Views With.