MagnaTherm Hydronic Boiler

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 your 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 was done through the use of the unique Laars VARI-PRIME™ variable speed boiler pump control that optimizes the three major variables of boiler operation – combustion efficiency, blower efficiency and boiler pump efficiency.

MagnaTherm’s advanced VARI-PRIME™ pump control seamlessly matches 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.

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 with built in VARI-PRIME™ controls can offer such savings in one package!


• VARI-PRIME™ boiler pump flow control for optimized installed efficiency
• 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