Subject: 

Instances of Esyline being installed without an expansion tank on water systems. 

• Issues: 
  • Lack of an expansion tank can lead to over-pressurization due to thermal expansion from the water heater. 
  • Presence of a check valve in both Esybox and Esybox Mini 3 prevents expanded water from being relieved to the city or well system. 
• Effect: 
  • High pressurization can cause leaks in equipment attached to the system, including the pump. 
  • Over-starting and stopping of the pump can cause wear on internal components
• Recommended Fixes: 
  • Inspect the system when installing these pumps. 
  • Install an expansion tank if one is not present or if the existing tank is waterlogged. 
    • ⁠Esybox Mini 3 with a normal peak flow of 10 GPM would need a 2 gallon pressure tank 
    • Esybox & Esybox Diver with a normal peak flow of 20 GPM would need a 4 gallon pressure tank 
    • Esybox Max with a peak usage of 50 GPM would need a 10 gallon pressure tank 
• Installation location: between the discharge of the pump and the water heater, or on the cold incoming line of the water heater. 
• Ensure compliance with local codes, which require an expansion tank whenever there is a check valve in the incoming line to the water heater. 
• Result:
  • Reduction of water hammer risk
  • Reduction of start/stop instances
• Contact Information: 

For any questions, contact DAB Pumps Service Department at service.us@dabpumps.com