Boiler Buddy Buffer Tanks

Made by Hot Water Products, Inc. in the U.S.A.

The Boiler Buddy is designed to be used in heating systems with low-mass boilers, geothermal, chilled water applications, or low-mass radiation. Boilers operating at low loads will short cycle which leads to sooting, premature component failure (nuisance lockouts) and inefficiency. The Boiler Buddy tank is a factory insulated and jacketed storage tank, adding mass to the system and providing the necessary buffer to prevent short cycling.

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Product Description

BB-18, BB-30 come standard with 1 aquastat well.

BB-50-G, BB-80-3W, & BB-119-3W include 3 aquastat wells for precise temperature measurement, especially for geothermal applications.

BB-80-C includes a carbon steel internal coil and 1 aquastat well. This feature allows for flexibility in design. Design applications include; hydronic buffer tank/heat supplemented by solar, geothermal, or wood boiler.

*Boiler Buddy tanks are not for use with potable water.

Boiler Buddy is a division of Hot Water Products Inc. The Boiler Buddy buffer tank line was designed by owners of HWP, Howard Endres and Gregory “Jack” Daniels, after they discovered a need while working closely with contractors in the field to overcome short cycling in low-mass boiler installations to improve efficiency and longevity.

Boiler Buddy Features

  • Aquastat Control Well included for precise temperature measurement for heating and geothermal systems.
  • Air Eliminator built into the top of tank provides optimal air elimination for the whole system.
  • Boiler Buddy provides hydro separation, making piping design simple.
  • Full port boiler drain valve allows easy sediment removal and also works exceptionally well for fast filling the system.
  • Designed with large nipples to provide better flow that is easier on equipment, more efficient, and allows for better mixing in tank.
  • ¾” full port ball valve now upgraded to a ¾” Webstone Ball Valve with integrated hose bib fitting which allows for fast and easy drainage

Boiler Buddy Overview Diagram

Boiler Buddy includes the following components:

  • Premium high capacity air eliminator
  • All necessary nipples
  • Premium full port boiler drain
  • Brass hose bushing
  • Brass aquastat dry well(s) – 1 or 3 depending on model

Warning: This unit is NOT suitable for non-oxygen barrier tubing.

Boiler Buddy Specifications

Model Dimensions – Height Dimensions – Diameter Capacity U.S. Gallons Max Pressure PSI
BB-18 46″ 14 1/4″ 18 75
BB-30 70 1/2″ 14 1/4″ 30 75
BB-50-G 72″ 19 1/4″ 50 75
BB-80 (3W) 71 1/4″ 23 1/8″ 80 75
BB-119 (3W) 72 1/2″ 27″ 119 75
BB-80-C 69″ 24″ 80 75


Model Primary/
Secondary Connections NPT Male
Drain Connections NH(M) Air Vent NPT Shipping Weight (lbs) Number of Sensor Wells
BB-18 1 1/4″ 3/4″ 1/2″ 55 1
BB-30 1 1/2″ 3/4″ 1/2 83 1
BB-50-G 1 1/2″ 3/4″ 1/2 115 3
BB-80 (3W) 2 1/2″ 3/4″ 1/2″ 128 1
BB-119 (3W) 2 1/2″ 3/4″ 1/2″ 217 3
BB-80-C 2 1/2″ 3/4″ 1/2″ 153 1
Boiler Buddy Specifications Diagram

View Specification Sheet for Boiler Buddy

Boiler Buddy Installation

Boiler Buddy Installation Graphic





Boiler Buddy Brochure
Boiler Buddy Installation Manual
Boiler Buddy Buffer Tank Spec Sheet
Boiler Buddy is Made In America
Boiler Buddy Warranty