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Featured Video - Grundfos Pumps - 22nd December 2016

Function & Sizing of Boiler Shunt Pumps

Function and sizing of a boiler shunt pump

Find out more about why a boiler shunt pump is needed, and what does it do for the system you’re designing? Learn the answers in this video.

To design the optimal boiler system you need to consider a number of options. Grundfos can help you to make the right choices.

Overcome challenges by finding out more about the rationale about using non-condensing vs condensing boilers:

Non-condensing boilers can only work if the water returned to the boiler doesn’t drop below the dew point of the moisture in the flue gas. Condensation of the flu gas can cause significant boiler corrosion while too high a temperature difference results in thermal stress.

Condensing boilers, meanwhile, must be able to achieve condensation of exhaust gas on the heat exchanger to run efficiently. If the temperature of the water returning to the boiler is too high, little or no condensation is possible.

The Grundfos solution:
Non-condensing boilers can use the Grundfos TPE3 and an added temperature sensor instead of using a normal shunt pump running at full speed. The sensor measures the temperature of the water returning to the boiler, and ensures the right temperature is maintained at all times. This secures optimum boiler protection and reduces cost of operation.

Condensing boilers can benefit from FLOWLIMIT technology as it sets the maximum system flow in order to maintain the right return temperature and allow for condensation. This ensures higher operation efficiency by utilising the latent heat potential.

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