Technical Manual

Vitocell 300-V Sizing
Continuous Flow Capacity Chart
VITOCELL 300-V 15
Example: Vitocell 300-V, 119 USG / 450 ltr capacity
Assume boiler output to tank is 238 MBH. Enter chart at left and draw horizontal line across to recovery ra te of 284 GPH / 4.7 GPM for
140°F / 60°C domestic hot water under column A. Where the horizontal line intersects the 194°F / 90°C curve is the point of intersection
for the diagonal line us ed to size the pump. The diagonal line begins a t the origin and goes through the point of intersec tion extending up to
the top of the chart. Read between the reference diagonal lines to get a pump specification of 20 GPM at 8.4 ft. To summar ize: For a
Vitocell-V 300 with 119 USG / 450 ltr capacity and 238 MBH input, the boiler water temperature is 194°F / 90°C, difference between
boiler return and supply water temperature is 29°F / 16°C, recovery ra te is 4.7 GPM of 140°F / 60°C DHW, and the pump require d is 20
GPM, 8.4 ft. plus pressure drop in piping and boiler. If a multiple-tank application is required, i.e. 4 tanks at 2 38 MBH input each, then the
pump selection would be (4 x 20 GPM) 80 GPM at 8.4 ft. plus piping pr essure drop.
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