Category // Gas Boilers

The Vmax

Max Input: 154,000 BTU/H Available in a Plus version with built-in indirect water heater.

  • Built-in loop and pump
  • Field Convertible gas system
  • Universal vent connections
  • Up to 10:1 Turndown ratio
  • Cascading capable

The Vmax uses a stainless steel down-fired heat exchanger which ensures a long product life and an enduring source of home comfort. The fire tube heat exchanger optimizes heat transfer, which maximizes efficiencies.

Maximum VALUE

The Vmax includes a built-in primary loop, circulator and high-energy spark ignition as standard features. The Vmax is competitively priced, which makes it unmatched in the industry.


The Vmax features universal flue connections and is easily converted from natural gas to propane. The Vmax is available in a PLUS version and is engineered to make installation, setup and service easy.

Boiler Features:

  • Fully Modulating burner with up to 10:1 turn-down ratio
  • High-energy spark ignition
  • Zero clearance to combustibles
  • Advanced integrated control
  • Low water pressure cut-off
  • Easily-programmable display
  • Field conversion from Natural Gas (factory) to Propane
  • No-glue universal vent connections
  • Water pressure sensor
  • Auto air vent
  • 120VAC outlet for condensate pump
  • On/off switch
  • Direct vent or indoor combustion air
  • Certified ANSI Z21.13

Controller Features:

  • High-limit safety control
  • Domestic hot water priority
  • Cascade up to 16 Vmax boilers
  • Service reminder
  • Night setback option
  • Lockout and error history
  • Runtime accumulation
  • Freeze protection
  • Adjustable outdoor reset
  • Optional control board expansions

Plus Features:

  • Built-in 16-gallon indirect water heater
  • Low loss header manifold (primary loop)
  • Internal primary circulator
  • Reduced boiler cycling
  • DHW tank temperature sensor
  • Quick connect components for easy service
  • Fully-integrated plumbing for easier installation

To view any of the documents below please click on the link to view online or download in PDF format. If you have any queries about any of our products please contact us. Thank You.

Sales Brochure Download
Sales Brochure (French) Download
Installation & Operations Manual Download
Installation & Operations Manual (French) Download
Display Menu Operating Guide Download
VM110 Submittal Download
VM110P Submittal Download
VM153 - Submittal Download
VM153P - Submittal Download
Vmax Suggested Specifications Download
Cleaning Instructions Download
Warranty Information Product Registration
Coverage Coverage Period Coverage Rate Components Covered Additional Terms and Conditions
BASIC Years 1 through 5 100% All parts(including Pressure Vessel) Click here for full terms and conditions
Years 6 through 10
Year 11 and beyond
Pressure Vessel only (also applies to the VM110P Indirect Fired Water Heater Tank) See here for full terms & conditions

NTI is an industry leader

Our 40-year-old family business is committed to continuous product improvement. When you buy NTI, you buy the best.