Hi-R-Temp Fuel Fired Hot Water Boilers

  • Hi-R-TempFull Output in 5 Minutes
  • Fully Modulating Output
  • Compact Size & Weight
  • Closed Loop System
  • High Temperature, High Pressure Capability


Capacities from: 400,000 to 20,000,000 BTU/HR
Temperatures: Up to 750° F
Completely Packaged, Fully Tested

Theory of Operation

The HI-R-Temp® is a forced circulation coil type hot water boiler in which water circulates through a set of coils. The coils are parallel connected and have a minimum of seven concentric layers. The unique coil design of the Vapor Power unit allows for installation in systems with a very high ∆T, even greater than 100° F. The Hi-R-Temp® is available in design pressures up to 4,000 psig and excels in a variety of high temperature, high pressure applications.

Combustion air and fuel are controlled by PID control in response to water outlet temperature. The small volume and high velocity water flow allow the HI-R-Temp® to respond quickly to changing system output requirements.


With over 100 years of experience in the industry and thousands of operating units, Vapor Power stands ready to assist with any specific application. For the marine industry, computer simulation of process systems and heat loss analysis are available to ensure the proper system for your application. Common applications include:


The Hi-R-Temp® hot water boiler is available with the latest in communications and controls technology. Linkageless burner controls are a standard feature, when desired, allowing for optimal efficiency at all firing rates. A variety of PLC and HMI solutions are available and our in-house programming provides customized solutions for every application. Remote data acquisition and control is available via ModBus, Ethernet, Bacnet, or other communication protocol.




After Market

As one of the industry’s leading manufacturers of boilers, packaged steam generators and thermal fluid heaters, Vapor Power International has everything you need to keep your boilers operating in top condition. That includes complete retrofit upgrade kits to outfit your boilers with the latest in controls and components.