Viessmann Vitocrossal 300 CU3A Application Manual page 63

Radiant Sizing:
Estimating Radiant Tubing
6" OC Qty = FT 2 of space x 2
12" OC Qty = FT 2 of space x 1.2
Estimating BTUH for Radiant
Floor Warming = 15-20 btuh/ft
Floor Heating = 35-50 btuh/ft
Expansion Tank Quick Sizer
Boiler Output
Baseboard
25,000
50,000
75,000
100,000
125,000
150,000
175,000
200,000
250,000
300,000
Buffer Tank Sizing
Minimum
Tank Boiler Run Time x (Min Boiler Firing Rate - Smallest Zone)
Volume
Pool Sizing
Pool Capacity (gallons):
Circular Pool = Avg. Depth x Diameter
Rectangular Pool = Avg. Depth x Length x Width x 7.5
BTUH Requirement:
Pool Capacity x 8.34 x Temp Rise
BTUH =
Hours to Heat Pool
Temp. Difference
between pool temp and
ambient air temp (°F)
BTUH/Ft 2
Finned Air Handler/
Unit Heater
15 15
15 15
30 30
30 30
30 60
30 60
60 60
60 90
60 90
90 30V
500 x ΔT
2 x 5.9
10°
105 158
Cast
Radiator
15
30
30
60
60
90
30V
30V
30V
30V
15° 20°
210
Cast Iron
Baseboard
15
30
60
60
90
90
30V
30V
40V
40V
25° 30°
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