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A boiler shunt pump is a specialized circulator, such as those featured on Alternative Heating & Supplies, that circulates water directly from a boiler's flow pipe back into its return pipe. This action maintains consistent temperatures, prevents thermal shock, and reduces condensation, often using modern ECM technology to improve efficiency, note sources like Grundfos and EnergizeCT.

Preventing Condensation/Corrosion: Keeps return water temperatures above the dew point in conventional boilers, preventing corrosion.
Minimizing Thermal Stress: Reduces the temperature differential (
$cap delta cap T$
) between the top and bottom of the boiler, reducing material stress.
System Optimization: Used in primary circuits to ensure proper flow and efficiency, according to Hamworthy Heating.
Individual Boiler Control: When used in multi-boiler systems, one shunt pump per boiler allows for isolating non-firing boilers.

Individual Shunt Pumps: Each boiler has its own pump, which provides high redundancy (if one fails, others work) and allows for better control during boiler operation.
Primary Circuit Pump: A single, larger pump handles the entire primary loop, which can be more cost-effective but offers less flexibility than individual pumps, as noted in Hamworthy Heating and MODBS.

Overrun Period: Shunt pumps should be wired to allow a ~5-minute overrun after the boiler shuts down to dissipate residual heat.
Flow Rates: The pump must maintain the minimum flow required by the boiler manufacturer.
Modernization: Replacing old pumps with high-efficiency electronicaly commutated motors (ECMs) can reduce operating costs by up to 85%.
Components: Shunt setups typically include the pump, and in some cases, dedicated shutoff valves for maintenance, as found on Reka.

Boiler shunt pump - Grundfos
Boiler shunt. The primary task of the boiler shunt is to ensure that the difference in temperature between the top and the bottom ...
Grundfos
Which is best – a primary circuit pump or boiler shunt pumps?
Temperature control in condensing and non condensing boiler ...
A shunt in a conventional boiler keeps the return water temperature above the flue gas dew point, avoiding corrosion and thermal s...
Grundfos

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Boiler shunt pump

Grundfos

https://www.grundfos.com › learn › research-and-insights

Grundfos

https://www.grundfos.com › learn › research-and-insights

The boiler shunt pump circulates the water from the flow pipe into the return pipe or directly into the boiler. Max. temperature difference is approx. 10-20 °C.Read more

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Primary vs Boiler Shunt Pumps in Commercial Heating

Hamworthy Heating

https://hamworthy-heating.com › articles › primary-circ...

Hamworthy Heating

https://hamworthy-heating.com › articles › primary-circ...

In this article we'll look at the different pump options and their pros and cons, as well as suitability to different applications.Read more

Boiler circulating pumps for the boiler room

Grundfos

https://www.grundfos.com › learn › research-and-insights

Grundfos

https://www.grundfos.com › learn › research-and-insights

In some cases, a boiler shunt is fitted to avoid too low supply water temperature to the boiler. This is to avoid unwanted condensation inside the boiler ...Read more

Videos

SHUNT & DESTRATIFICATION PUMP

YouTube Commercial Gas Engineer

May 17, 2021

COMMERCIAL SHUNT PUMP

YouTube Commercial Gas Engineer

Jun 17, 2024

How the boiler circulating pump works.

YouTube grayfurnaceman

Nov 10, 2012

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Web results

boiler shunt pumps

Anhui Shinhoo Canned Motor Pump Co., Ltd.

https://www.shinhoopump.com › boiler-shunt-pumps_sp

Anhui Shinhoo Canned Motor Pump Co., Ltd.

https://www.shinhoopump.com › boiler-shunt-pumps_sp

Heat Pump Circulator Pumps · Master H · Grand · Pro · Wall Hung Gas Boiler Pumps · GPD · GPA · GPA Ⅲ U · Booster pumps · AHB · AP · AHM · F-AHM · Aquamaster ...Read more

Grundfos UPS15-58FC Pump Outside Wood Boiler ...

Outdoor Furnace Supply

https://www.outdoorfurnacesupply.com › grundfos-ups1...

Outdoor Furnace Supply

https://www.outdoorfurnacesupply.com › grundfos-ups1...

For Residential and Light Commercial Heating Systems. This pump can be used in both open and closed systems.Read more

$163.95In stockFree delivery30-day returns

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Shunt pump installation for boiler temperature control?

Facebook · Crown Royal Stoves Support Group

30+ comments · 6 months ago

Facebook · Crown Royal Stoves Support Group

30+ comments · 6 months ago

The basic idea is that the heat pump is in a small loop with a buffer tank to help to reduce cycling, but also as I'd like to experiment with ...Read more

Top answer: If 145 is the lowest you get to I wouldn’t be worried about mixing hot water with it. Crown ...

Should pumps run continuously or only when calling for heat?

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Faulty shunt pump in boiler system - Facebook

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Boiler Circulator Pumps Page

Energize CT

https://www.energizect.com › gas-heating-cooling › boil...

Energize CT

https://www.energizect.com › gas-heating-cooling › boil...

Boiler circulator pumps use less electricity and offer a more efficient way to move hot water through hydronic (“forced hot water”) heating systems. Upgrading ...Read more

Missing: ~~shunt~~ ‎| Show results with: shunt

Circulation Pump Installation Diagram – A Guide for Heating ...

getamuhendislik.com

https://www.getamuhendislik.com › blog › post-circulati...

getamuhendislik.com

https://www.getamuhendislik.com › blog › post-circulati...

Jan 31, 2025 — Boiler Shunt (Short Circuit) Pump. In heating boilers, minimizing temperature differences within the boiler body is crucial for its longevity.Read more

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