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Mixergy iHP X FAQ

A quick, helpful overview of what the Mixergy iHP X does, how it behaves, and what to expect from your new hot water system.

What is the Mixergy iHP X?

iHP-X-PortraitThe Mixergy iHP X is an all-in-one hot water system with an integrated heat pump. It heats and stores your hot water efficiently using air energy instead of direct electric or gas. It learns your routine over time and heats only what you need.

How is iHP X different from a standard hot-water cylinder?

A normal cylinder just stores hot water. iHP X both heats and stores it.

  • It uses a small heat pump rather than direct electric or gas for most heating, making it 3x more efficient. 
  • It learns how much hot water your household uses.
  • It gives clear visibility of hot water levels.

How is iHP X different from a combi boiler?

A combi heats water instantly. iHP X pre-heats water efficiently in advance.

  • It’s quiet and doesn’t burn gas.
  • It heats steadily rather than in sudden bursts.
  • It is generally 3x more efficient over time.

What sounds or behaviour should I expect?

You may hear a gentle hum, similar to a fridge, when it’s running.

It may heat during the night or early morning, which is normal and helps reduce energy use.

Why does the iHP X heat at night?

The system prefers off-peak electricity hours, which are cheaper and more efficient.

  • Smart tariff users can add their tariff in the app so heating happens during the lowest-cost times.
  • You can override schedules if you prefer daytime heating.
  • Night-time heating is a sign of efficient operation.

How does the iHP X work?

The unit draws warmth from the surrounding air and transfers it into the water.

It runs best when left on continuously and automatically learns when your home typically needs hot water.

Do I need to change my settings every day?

No. The iHP X is designed to manage itself.

Its learning feature adjusts heating automatically based on your routine.

Is it OK to turn the system off?

The system works best when left on continuously.

Switching it off regularly reduces efficiency and interrupts its learning.

How do I get more hot water quickly?

Use Boost on the Gauge or in the Mixergy app.

This adds extra hot water on demand.

Is night-time operation noisy?

No. The system produces only a gentle hum, similar to a fridge. This is normal.

What are the best tips for everyday use?

  • Leave the system on.
  • Use Boost only when extra hot water is needed.
  • Let the system learn your routine rather than adjusting settings daily.

Need more help?

Call our Homeowners & Residents line: