Choose coolant pump voltage to match the rack architecture first, then choose the model by flow and head within that voltage. 12 V covers legacy and light edge nodes, 24 V remains the mainstream rack standard, and 48 V is the fast-growing choice for OCP-style and AI racks. The voltage band narrows your options sharply — after that, only flow rate and head decide the model. This guide matches each voltage to the hardware and the duty it covers.

The Voltage Map at a Glance

Pick the voltage column first, because it is dictated by the power bus; only then compare the rows.

12 V: Legacy and Light Edge Nodes

12 V loops serve the smallest cooling duties — a single low-power server, an edge node, or a small auxiliary loop where the heat load is light. The P6038 (12 V, up to 6 L/min, up to 3 m of head, 10 W rated power) is sized exactly for this range. Choose 12 V only when your rack power bus is already 12 V and the loop flow demand stays under about 6 L/min. For anything denser, the pressure drop of real cold plates and quick disconnects will outrun 3 m of head.

24 V: The Mainstream Rack Standard

24 V is the workhorse of rack-level liquid cooling. It pairs with most current server auxiliary power and covers the bulk of 15–25 kW rack duties. Two models span the range:

P4552 (24 V, 11 L/min, 11 m, 28 W): simple loops, single racks with low cold-plate pressure drop.

P6092 (24 V, 25 L/min, 27 m, 88 W): high-drop loops, dual racks, and denser GPU duties.

Staying on 24 V keeps power conversion simple and lets you scale from light to heavy duty within the same bus.

48 V: The OCP and AI Upshift

48 V server architecture is spreading quickly because it halves current at a given power, cutting distribution losses and leaving more room for silicon. The P609248I04 (48 V, 30 L/min, 20 m, 100 W) is built for these loops — the highest flow in the DC range, matched to the higher heat density of AI racks. If your rack is on the OCP 48 V bus, this is the voltage to spec; if it is not, retrofitting 48 V is a rack-level decision, not a pump-level one.

How to Choose Within One Voltage

Once the voltage is fixed, two numbers pick the model:

Required flow rate from the heat load and design ΔT.

Required head from the loop's total pressure drop, plus 10–20% margin.

Pick the smallest model whose curve covers both. Do not chase a higher voltage to get more flow — the correct move inside one voltage is to step to the next model, not to change the bus.

FAQ

Q: Should I choose 12 V, 24 V, or 48 V for my coolant pump?

A: Match the rack architecture: 12 V for legacy and edge nodes, 24 V for most current racks, 48 V for OCP and AI racks. Then choose the model by flow and head.

Q: Can a 48 V pump replace a 24 V pump?

A: Only if your rack power bus supplies 48 V. Voltage must match the available supply; a 48 V pump on a 24 V bus will not run.

Q: Which pump handles the highest flow?

A: The P609248I04 (48 V), at up to 30 L/min with 20 m of head and 100 W rated power — built for high-density 48 V loops.

Q: What is a 48 V liquid cooling loop?

A: A rack-level loop powered from a 48 V server bus, common in OCP and AI racks, chosen because 48 V reduces current and distribution losses at high power.

Q: Does higher voltage mean a better pump?

A: No. Higher voltage only matches higher-power architectures. A well-sized 24 V pump on a 24 V loop outperforms an ill-fitted 48 V pump everywhere else.

Coolant Pumps Across 12 V, 24 V, and 48 V from Shenpeng Technology

Shenpeng Technology's DC pump line covers all three voltages: the P6038 (12 V, 6 L/min, 3 m, 10 W), the P4552 (24 V, 11 L/min, 11 m, 28 W), the P6092 (24 V, 25 L/min, 27 m, 88 W), and the P609248I04 (48 V, 30 L/min, 20 m, 100 W). Contact our engineering team with your rack voltage, heat load, and loop pressure drop — we will match the right low voltage cooling pump to your liquid cooling loop.