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Expansion Water Tank Flexcon SXHT40
Expansion Water Tank Flexcon SXHT40

Expansion Water Tank SXHT40 Flexcon

Brand: Flexcon
Mfg Number:
  • Tank Capacity: 20 Gallons
  • Maximum Temperature: 240 F
  • Type: High Temperature Hydronic
  • Net Boiler Output: 425 to 600 BtuM
Availability: Out of Stock
Product Information
Retail: $280.67 Price: $240.58
You Save: $40.09 (14.3%)


The Flexcon Expansion Water Tank SXHT40 is a freestanding unit constructed of deep drawn welded steel domes that carry a capacity of 20 gallons of water and features an appliance quality finish on the outside of the tank that provides many years of service within damp basements or crawl spaces. The Flexcon patented double diaphragm design is constructed of butyl rubber that is engineered for a longer life offering low permeability rates at higher temperatures. The oversized diaphragm maximizes tank drawdown, minimizes wear and eliminates diaphragm stretch, all of which enhance the tank's longevity. This tank utilizes a welded system connection with a built-in hex nut for easy, hassle-free installation and the brass shredder valve includes an o-ring seal ensuring air side integrity minimizing leaks. Every Flexcon Hydronic Expansion Tank is pressure tested and backed with a 5 Year Written, Limited Manufacturer's Warranty. Each package includes the tank, an air scoop and vent for added installer convenience.

Flexcon Expansion Water Tank SXHT40 Specifications
ItemExpansion Tank
TypeHigh Temperature Hydronic
Tank - Gallons20.0
Inlet / Outlet NPT1 M
Maximum Working Pressure100 PSI
Net Boiler Output425 to 600 BtuM
DiaphragmStrong, Flexible, Butyl
Maximum Temperature240 F

Flexcon Expansion Water Tank SXHT40 Features:

  • Constructed of Deep Drawn Welded Steel Domes
  • Freestanding Unit
  • Uses Flexcon Patented Double Diaphragm Design
  • Butyl Diaphragms - Constructed of butyl rubber for longer life
  • Oversized Diaphragm - Maximizes tank drawdown, minimizes wear and tear
  • Welded System Connection with Built-In Hex Nut - For easy installation
  • Brass Shredder Valve with O-Ring Seal - Ensures air side integrity
  • Appliance Quality Finish - Provides years of reliable service in damp basements or crawl spaces
  • Pressure Tested
  • 5 Year Written Limited Warranty
  • Package Includes Tank, Air Scoop and Vent - Provides added installer convenience

Compliance & Restrictions - Hazardous Material


Heater-Store or any of it's affiliates are not responsible for damages or injury caused by wrongful installation or application of this product.

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