Comparison of Stirling UltraCold and Revco UxF Series Specifications Company Unit Storage Volume (cu ft) Storage Capacity Voltage Electric supply Lifetime (years)* Door Opening Recovery Stirling Ultracold Revco Revco SU780U UFX50086A/D/V UFX60086A/D/V 27.5 24.1 28.8 600 boxes 500 boxes 600 boxes 115V/208115V/208100-240V 230V/230V 230V/230V 15amp+ 16A 16A 12 12 12 1.7 hours 28 min 33 min Pricing Total Price Subtotal** Difference from total Total Price/cu ft Floor Space Required Width (in) Depth (in) Floor space (sqft) Average space cost per sqft per year*** Total space cost (for lifetime) Total space cost per cuft of storage space $ $ 11,800.00 $ 12,800.00 $ 14,385.55 $ 13,850.00 $ 523.11 $ 2,585.55 $ 489.63 $ 1,585.55 444.44 $ $ $ 36 34.2 8.55 500.00 $ 51,300.00 $ 1,865.45 $ 38 37.6 9.922222222 500.00 $ 59,533.33 $ 2,470.26 $ 43.6 37.6 11.38444444 500.00 68,306.67 2,371.76 Energy Consumption Electric Cost (cents/kWh) Steady state energy use (kWh/day) set at 80Celsius Annual energy use (kWh) - with freezer set at 80C Annual steady state operating costs Total operating cost (for lifetime) Total operating cost/cu ft Steady state energy use (kWh/day) Energy Savings Mode**** Annual energy use (kWh) in EM Annual operating costs Total operating costs (for lifetime) Total operating costs/cu ft Payback Information 7.5 7.5 7.5 9 19 21.3 $ $ $ 3285 246.38 $ 2,956.50 $ 107.51 $ 6935 520.13 $ 6,241.50 $ 258.98 $ 7774.5 583.09 6,997.05 242.95 $ $ $ 7.5 2737.5 205.31 $ 2,463.75 $ 89.59 $ 17 6205 465.38 $ 5,584.50 $ 231.72 $ 17 6205 465.38 5,584.50 193.91 Annual Energy Saved comparing a Sterling at 80C (kWh) Annual Costs Saved Years to payback (with a $3,000 rebate) $ 0.00 - $ $ Years to payback (with actual price difference) Total Costs Total Cost of Ownership Total Cost of Ownership per cu ft Delta total cost of ownership 3650.00 273.75 $ 10.96 9.444931507 $ $ 4489.50 336.71 8.909678138 4.708913391 54,256.50 $ 1,972.96 $ 65,774.83 $ 2,729.25 $ 75,303.72 2,614.71 $ 11,518.33 $ 21% 21,047.22 32% Notes * Lifetime for Revco units can vary between 8-14 years ** The subtotal for the Stirling does not include the Medical Device Surcharge or the shipping rate *** Average space cost can vary between $400-$600 per sqft in large modern lab buildings **** Energy savings mode for the Stirling unit is when set at -70degC, but there is a separate mode for the Revco units in which the range of temp is larger