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READ CAREFULLY THE PRODUCT 

INSTALLATION & OPERATION INSTRUCTIONS.   

FAILURE TO FOLLOW THE INSTRUCTIONS AND WARNINGS IN THE 

MANUAL MAY RESULT IN SERIOUS OR FATAL INJURY AND/OR 

PROPERTY DAMAGE, AND WILL VOID THE PRODUCT WARRANTY.  

THIS PRODUCT MUST BE INSTALLED BY A QUALIFIED 

PROFESSIONAL.  FOLLOW ALL APPLICABLE LOCAL AND STATE 

CODES AND REGULATIONS, IN THE ABSENCE OF SUCH CODES, 

FOLLOW THE CURRENT EDITIONS OF THE NATIONAL PLUMBING 

CODE AND NATIONAL ELECTRIC CODE, AS APPLICABLE

This Product, like most Products under pressure, 

may over time corrode, weaken and burst or 

explode, causing serious or fatal injury, leaking or flooding and/or property 

damage. To minimize risk, a licensed professional must install and 

periodically inspect and service the Product. A drip pan connected to an 

adequate drain must be installed if leaking or flooding could cause property 

damage. Do not locate in an area where leaking could cause property 

damage to the area adjacent to the tank or to lower floors of the structure.

EXPLOSION OR RUPTURE HAZARD.

 A relief 

valve must be installed to prevent pressure in 

excess of local code requirement or maximum working pressure 

designated in the Product Manual, whichever is less.  Do not expose 

product to freezing temperatures or temperatures in excess of 450°F.  

Replace the Product if corroded, damaged or with diminished integrity.  

Failure to properly size the product or follow these instructions may result 

in excessive strain on the system and may lead to product failure, serious 

or fatal personal injury, leakage, and/or property damage. 

FOR USE IN CLOSED HYDRONIC SYSTEMS ONLY.

 Do not install on 

domestic water systems, or in open heating systems. Corrosion and tank 

failure may result.

HOT WATER BUFFER TANKS

CLOSED LOOP HEATING SYSTEMS HWBT SERIES ASME

INSTALLATION & OPERATION INSTRUCTIONS

THIS IS THE SAFETY ALERT SYMBOL. IT IS USED TO ALERT YOU TO POTENTIAL PERSONAL INJURY AND OTHER 

HAZARDS. OBEY ALL SAFETY MESSAGES THAT FOLLOW THIS SYMBOL TO REDUCE THE RISK OF PERSONAL 

INJURY AS WELL AS PROPERTY DAMAGE.

Models HWBT120-2 through HWBT300-4/4

NOTE:

  Inspect for shipping damage and notify freight carrier or store where purchased immediately if damage is present.  To avoid risk of personal 

injury and property damage, if the product appears to be malfunctioning or shows signs of corrosion, call a qualified professional immediately.  Current 

copies of the Product manual can be viewed at www.amtrol.com.  Use proper safety equipment when installing. 

2 PORT

4 PORT

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