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Noise and neighbours: what a hydrogen system sounds like

A generator running through the night is one of the fastest ways to fall out with the neighbours. A system with no engine changes that conversation.

Why there is no engine noise

A fuel cell makes electricity through a chemical reaction across a membrane. There is no combustion, no pistons and no exhaust, so none of the thumping and droning of a diesel or petrol generator. The system is designed to be quiet, with no engine and no fuel runs, which matters most at night when sound carries and generators are hardest to live with.

What it would keep running

Overnight charging without a generator drone
Quiet backup near bedrooms
Fans and pumps at heat pump levels
No exhaust drifting next door
No fuel deliveries at odd hours

What you might still hear

Quiet does not mean silent. There are pumps that move water, fans that cool the fuel cell, electrolyser and inverter, and valves that click as the system changes mode. You might hear a gentle hum from the enclosure on a still night when the electrolyser is charging on off-peak power. These sounds are more like a heat pump outdoor unit than a generator.

We will not publish decibel figures until the bench demo and pilot homes measure them in real conditions. Treat any noise claim from anyone, about any equipment, as a figure you should see measured at a stated distance, not a promise in a brochure. The same goes for the turbine if you add one.

How it works →

The H2OME loop: an electrolyser splits water into hydrogen, the hydrogen is stored in a tank for weeks, a fuel cell turns it into electricity for your home, and the water returns to the loop.

Siting with neighbours in mind

Place the enclosure where its fans face away from bedroom windows, both yours and next door's. Avoid hard corners that bounce sound, and use the house or a shed as a buffer if possible. Local councils have noise rules, often stricter at night, so check them. If you are adding a wind turbine to charge it, that is likely to be the louder part of the setup.

Questions

Is it quieter than a heat pump?

It is designed to be in a similar range, but we will not claim a figure until it is measured on the bench and in pilot homes. The cooling fans are the main source of sound, much like an outdoor heat pump unit.

Will it run at night?

Yes. Charging on night-rate power means the electrolyser often runs overnight. That is why low noise matters and why siting away from bedrooms is worth thinking about, especially on smaller sections.

Do neighbours need to be told?

There may be no legal requirement, but it is a good idea. Explaining that the box beside your shed is a quiet backup power system, not a generator, avoids worry and rumours. Council rules on notification vary, so check.

Elsewhere

Every use →

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