Specs and Docs



Commercial Boiler and Volume Water Heater

The Laars MagnaTherm is a boiler or volume water heater that is available in 6 sizes (1.6, 2.0, 2.5, 3.0, 3.5 or 4.0 million BTU's) and has everything you need to satisfy large input commercial applications. Laars engineers took a system efficiency approach when designing the MagnaTherm to ensure that its total installed efficiency is as high as possible. This is accomplished by the unique Laars VARI-PRIME™ variable speed boiler pump control which is standard equipmpent on all MagnaTherm hydronic boilers. The VARI-PRIME™ system optimizes the three major variables of hydronic boiler operation – combustion efficiency, blower efficiency and boiler pump efficiency.

The advanced MagnaTherm control system includes a cascading feature that allows for up to eight boilers to be lead lagged with onboard controls. This results in a modulating heating cell of up to 32 million BTU/hr with a combined 40:1 turndown. 

The MagnaTherm is an amazingly quiet and compact high-output commercial boiler / volume water heater.  These commercial units are small enough to fit thru a door (when used as a replacement boiler), large enough to meet your commercial needs, and quiet enough to stand next to and hold a conversation while under full load. Make the smart choice and begin saving money now, select the MagnaTherm for your high efficiency commercial boiler needs.

1600 to 4000 MBH - Indoor / Outdoor

VARI-PRIME™ Pump Control

MagnaTherm’s advanced VARI-PRIME™ pump control seamlessly matches hydronic boiler firing rate to boiler pump flow, reducing boiler pumping costs by up to an amazing 70 percent.  No other boiler offers on-board control functionality that balances combustion, air flow and water flow to optimize boiler efficiency like the VARI-PRIME™ system can. Standard equipment on hydronic boilers only.

The combined potential energy savings of the MagnaTherm’s high efficiency combustion coupled with the VARI-PRIME™ control system is huge. Only the Laars MagnaTherm hydronic boilers with built in VARI-PRIME™ controls can offer such savings in one package!

Start saving today. 
Install a VARI-PRIME™ equipped MAGNATHERM!

The MagnaTherm Advantage

  • VARI-PRIME™ boiler pump flow control for optimized installed efficiency (standard on hydronic boilers only).
  • AHRI certified 95% efficient condensing operation
  • Fully modulating 5:1 Turndown
  • Stainless Steel, gasketless heat exchanger
  • Multiple voltage options to easily match building service
  • A large, easy-to-navigate color touch screen display
  • Less than 10ppm NOX emissions
  • Small, lightweight vertical design
  • Knock down feature for tight retrofit jobs
  • Designed and Made in the USA!