NTI – VM153 Gas Boilers

Vmax Series

The Vmax Series is equipped with a high-performance down-fired fire tube stainless steel heat exchanger and has been designed to make installation, setup, and service easy.

The dedicated indirect tank connections and integrated primary loop pump make the Vmax Series unique in the boiler industry, setting a new standard in terms of ease of installation and peace of mind. Integrated and smart solutions that ensure quick and effective installation, even for complex applications.

Main Features

  • Built-in primary loop and circulating pump
  • High performance fire tube stainless steel heat exchanger
  • Vents in PVC, CPVC or Poly Propylene
  • Dedicated indirect tank connections
  • Universal vent connections with embedded test port
  • Easy to program display
  • Quick connect components


Input power 15.4 – 154 MBH
AFUE 95%
Heating capacity 141 MBH
Net AHRI Rating 122 MBH
Installation type Indoor Wall Hung (rack available for floor standing installation)
Weight 135 lb
Gas connection 1⁄2 in NPT female
Water connection 1 in NPT male
Air Inlet 3 in (max 150 ft)
Flue 3 in (max 150 ft)