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BoilerBuying Guide2026-03-10

Combi Boilers and Power Showers

Combis deliver mains-pressure hot water, so a separate shower pump usually isn't needed.

A common question is whether combis work with power showers. Here's the answer.

Mains-pressure hot water

Because a combi heats mains-fed water, it already delivers good pressure to showers without a separate pump in most homes.

When flow matters

If multiple outlets run at once, flow rate (not pressure) is the limit — size the combi for your peak demand.

Key takeaways

  • Combis give mains-pressure hot water
  • Usually no shower pump needed
  • Flow rate is the real limit
  • Size for peak simultaneous use

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Frequently asked questions

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