Vitocell-H 100 Sizing
Continuous Flow Capacity Chart
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Example: Vitocell-H 100, 53 USG / 200 ltr capacity
Assume boiler output to tank is 119 MBH. Enter chart at left and draw horizontal line across to recovery rate of 142 GPH / 2.4 GPM for
140°F / 60°C domestic hot water under column B. Where the horizontal line intersects the 194°F / 90°C curve is the point of intersection
for the diagonal line used to size the pump. The diagonal line begins at the origin and goes through the point of intersection extending up to
the top of the chart. Read between the reference diagonal lines to get a pump specification of 8.4 GPM at 1.7 ft. To summarize: For a
Vitocell-H 100 with 53 USG / 200 ltr capacity and 119 MBH input, the boiler water temperature is 194°F / 90°C, difference between
boiler return and supply water temperature is 30°F / 16.5°C, recovery rate is 2.4 GPM of 140°F / 60°C DHW, and the pump required is
8.4 GPM, 1.7 ft. plus pressure drop in piping and boiler.
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