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Monitor Hot Water Boilers
Natural Gas, Oil or Propane (LP)
Model 125 tankless instantaneous hot water heater fueled by Propane or Natural Gas
Brilliantly designed for ultra high efficiency and built with the highest quality components, these fully condensing, wall-hung units provide you with the greatest level of comfort for your money. Built to last forever with minimal service, they offer a multitude of installation options and can perform many tasks -space heating, domestic hot water, pool and spa heating, snow melt - you name it. Using high-grade stainless steel for the heat exchanger and cast aluminum for the water jacket, a lifetime of reliable operation is virtually assured! Our Monitor MZ Propane Boilers and MZ Gas Boilers are built to last.

These Energy Star® MZs are designed for condensing, a process that recovers the heat trapped in the water vapor produced by gas combustion. Condensing enables the boiler to extract all of the heat possible, saving you money year after year. Instead of a flue gas temperature in the 350º to 400º range as the conventional non-condensing boiler produces, the MZ's can be in the range of 50º for snowmelt applications to 170º for baseboard copper-finned operation. The difference in temperature reflects the heat going in the home, not up the chimney. Condensing is great for the environment because along with the condensed vapor, many pollutants are harmlessly drained away.

The clean-burning MZs exceed the strictest air quality standard in the US - the California South Coast Air Quality Standards - by 60%!

The MZ Boiler Model MZ25S
This model combines heat and domestic hot water and it's perfect for one-bathroom homes or condos where space is a premium.
The MZ Boiler Model MZ25C
This unit easily heats most homes and can produce an endless supply of hot water when combined with one of our BS indirect tanks.
The MZ Boiler Model MZ40C
This model has the highest output of the Monitor line and is perfect for larger homes and commercial applications.


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