A Twin Shower pump is designed to boost the water pressure of both the hot and cold water supply, delivering balanced flow to your shower system. However, many homeowners ask: can you use a twin shower pump as a single pump—that is, connect only one side (hot or cold) instead of both?
Twin Impellers: A twin pump has two impellers, one for hot water and one for cold water.
Balanced Pressure: Designed to provide equal pressure from both water supplies.
Applications: Ideal for mixer showers, bath fillers, and systems requiring even hot/cold flow.
A twin pump can be used as a single, but you must cap off the unused inlet and outlet properly.
The unused side should not be left open, as this can cause air ingress, leaks, or damage.
If you only need to boost hot water (for example, feeding into a thermostatic mixer shower), you can connect only the hot side and blank the cold.
Similarly, you can use only the cold side if that’s your requirement.
Running just one side of a twin pump won’t harm performance, but it may not be as efficient as a dedicated single impeller pump.
You may also hear more noise since the unused side is idle.
Pros
Flexible usage if you already own a twin pump.
Saves buying a new single pump if your needs change.
Provides strong boosting capability for one supply.
Cons
More expensive than buying a single pump.
Slightly bulkier installation.
May require extra care to cap unused inlets and outlets.
If you only ever need to boost one supply line (hot or cold), a single pump is simpler, quieter, and often cheaper.
If you have a mixer shower, where both hot and cold need equal pressure, a twin pump is the correct choice.
Yes, you can use a twin shower pump as a single by connecting only one side and capping the unused inlet/outlet. However, it’s usually better to use the pump type designed for your specific system:
Single pump for boosting one water supply only.
Twin pump for balancing both hot and cold water.
If you’re unsure, consult a qualified plumber to ensure the installation is safe, leak-free, and optimized for your shower system.
