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The Therm 660 EF is compact enough to install virtually anywhere. But don’t let the size fool you. This model is loaded with features including freeze protection and built-in high temperature capability (160°F).

Therm 660 EF Specifications:

• Non-Condensing
• Residential or Commercial Application
• Max Input (BTU) 140,000
• Min Input (BTU) 20,000
• Capacity at 35°F Rise (gpm) 6.6
• Capacity at 55°F Rise (gpm) 4.2
• Min Flow Rate 0.5 gpm
• Temp Range (°F) 100 - 160
• Temp Stability (°F) +/- 2
• Default Temp (°F) 120
• Energy Factor .82
• Thermal Efficiency 83%+
• Installation - Indoor
• Dimensions (w x h x d) 14" x 20½" x 7"
• Weight (lbs.) 36
• Inlet Connection ¾" NPT
• Outlet Connection ¾" NPT
• Gas Connection ¾" NPT
• Max Water Pressure 150 psi
• Min Water Pressure 30 psi
• Min NG Presure 4" WC
• Venting - Stainless Steel
• Vent Maximun Run 35'
• Energy Star Rated

Features and Benefits:

• Super compact 14" x 20½" x 7" size
• 83%+ thermal efficiency
• 140,000 BTU maximum input
• 6.6 gallons per minute capacity at 35F degree rise
• Minimum activation flow rate of 0.5 gallons per minute
• Electronic ignition
• Built in freeze protection
• Vents vertically or horizontally with 3” or 4” stainless steel
• Can be used in recirculation and space heating applications
• Backed with 15-year warranty
• Also available as an outdoor model, 660 EFO

Warranty:

• 15 year limited warranty on heat exchanger; 3 year warranty if used in direct recirculating applications
• 15 year warranty on heat exchanger if used if recirculated through a storage tank, 5 year warranty on all other parts