Use an approved room-sealed heater for a new bathroom installation

Why it matters

An unsuitable or poorly maintained heater can allow carbon monoxide into the bathroom.

What to do

1. Check the area, equipment, and household arrangement before starting.
2. For a new bathroom or shower installation, use an approved GU-marked room-sealed (balanced-flue) gas water heater installed by a registered gas installer; arrange a check every 18 months.
3. Stop and tell the employer if the situation is unsafe or unclear.

Sources and review

• Electrical and Mechanical Services Department — How to Purchase & Use Gas Water Heaters Properly
  Source checked: 2026-08-22

This page provides general home-safety information and does not replace medical, legal, electrical, or other professional advice.

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