• Touchscreen boiler controller provides a user-friendly interface for temperature programming and intuitive alerts with easy-to-understand warnings and error messages.
  • Manages up to 4 different heating loads without mixing and up to 5 pumps.
  • Built-in internet connectivity allows remote monitoring and diagnostics from either your PC or Mac.
  • When it comes to turndown ratio (the ratio between full-scale and minimum boiler outputs), the SL Series sets the industry standard at 5.75:1. This means greater efficiency for all your heating needs, no matter the conditions – from the coldest days of winter to milder days in spring.
  • Safety features include built-in alarm contacts and safety limits on the heat exchanger and burner plate.
  • Condensate draining system cleans simultaneously as it heats.
  • All models include supply and return connections on both right and left sides.


  • Limited lifetime warranty on heat exchanger with product registration
  • 5-year limited warranty on parts
  • 1-year limited warranty on labour

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Your Satisfaction, Guaranteed

We provide free quotes on all system replacements or new installations, and we’ll work with our vendors to make sure you are offered the best possible price. Contact us to learn more about financing options including low monthly payment schedules.

At First Call, customer service is our top priority. We stand behind the quality products we carry and are committed to providing a full range of Climate Protection Plans to ensure complete satisfaction over the lifespan of your boiler. Learn more about our full range of residential boilers. 

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