Propane Models
  TK-Jr LP TK-2 LP TKD-20 LP TM-1 LP
Input BTU Rate 17,000 - 140,000 Btu 19,000 - 175,000 Btu 19,000 - 175,000 Btu 25,000 - 225,000 Btu
Thermal Efficiency 84% 85% 85% 84.7%
First Hour Rating (DOE) 180 Gal/Hr 240 Gal/Hr 240 Gal/Hr 300 Gal/Hr
Gas Connection 3/4" NPT 3/4" NPT 3/4" NPT 3/4" NPT
Water Connection 3/4" NPT 3/4" NPT 3/4" NPT 3/4" NPT
Water Pressure 15 - 150 PSI 15 - 150 PSI 15 - 150 PSI 15 - 150 PSI
Gas Pressure 11" - 14" WC 11" - 14" WC 11" - 14" WC 11" - 14" WC
Shipping Weight 30 lbs. 74 lbs. 70 lbs. 85 lbs.
Dimensions (HxWxD) 20" x 14" x 6" 24.5"x16.5"x8.3" 24" x 16.5" x 8" 24" x 18" x 9"
Exhaust Vent 4 in. 4 in. 4 in. 4 in.
Electrical Supply AC 120V, 0.8A AC 120V, 0.8A AC 120V, 0.8A AC 120 V, 0.8 A
Water Flow Rate 0.75 - 5.8 GPM 0.75 - 6.9 GPM 0.75 - 6.9 GPM 0.75 - 9.6 GPM
Flow Rate 50°in 120°out 3.2 GPM 4.5 GPM 4.7 GPM 5.9 GPM
Warranty 5 yr Limited 5 yr Limited 5 yr Limited 5 yr Limited
Price $749.00 $1450.00 $1470.00 $2497.00