Is distilled water just boiled water? It’s one of the most common questions people ask — and the answer is no.
While both involve heat, boiled water and distilled water are completely different in terms of purity, performance, and how they should be used.
If you use the wrong one in appliances like irons, CPAP machines or humidifiers, it can lead to limescale build-up, damage, and reduced lifespan.
👉 Shop distilled water for appliances and home use
💧 What Is Boiled Water?
Boiled water is simply tap water heated to 100°C.
Boiling water helps:
- Kill bacteria
- Remove some dissolved gases
However, boiling does NOT remove:
- Minerals (like calcium & magnesium)
- Salts
- Heavy metals
- Chemical contaminants
- Limescale-causing compounds
Result: Boiled water is safer to drink — but not purified.
💧 What Is Distilled Water?
Distilled water goes through a much more advanced purification process:
- Water is boiled into steam
- The steam separates from contaminants
- The steam is condensed back into pure liquid
This produces ultra-pure water with extremely low dissolved solids.
Distilled water is:
- Free from minerals
- Free from salts
- Free from metals
- Low in organic impurities
- Ideal for appliances and technical use
👉 Read our distilled vs deionised water guide
🔍 Distilled Water vs Boiled Water: Key Differences
| Feature | Boiled Water | Distilled Water |
|---|---|---|
| Removes bacteria | ✔️ Yes | ✔️ Yes |
| Removes minerals | ❌ No | ✔️ Yes |
| Removes salts | ❌ No | ✔️ Yes |
| Removes metals | ❌ No | ✔️ Yes |
| Prevents limescale | ❌ No | ✔️ Yes |
| Suitable for appliances | ❌ No | ✔️ Yes |
Key takeaway: Boiling kills bacteria — but only distillation removes minerals and contaminants.
🔧 When Should You Use Distilled Water?
Distilled water is the better choice for:
- CPAP machines
- Steam irons & garment steamers
- Humidifiers
- Car batteries & cooling systems
- Laboratories & medical equipment
- Cosmetics & skincare
Using boiled or tap water in these can cause:
- Limescale build-up
- Blocked components
- Reduced efficiency
- Shortened appliance lifespan
👉 Read: Best water for steam irons
🛒 Distilled Water for UK Homes & Businesses
At The Somerset Clear Water Company, we supply high-purity distilled water manufactured in Somerset.
Customers choose us for:
- Lab-tested purity
- UK manufacturing
- Reliable supply
- 5L, 10L & 25L sizes
- Free next working day delivery
❓ Frequently Asked Questions
Is boiled water the same as distilled water?
No. Boiled water kills bacteria but still contains minerals and contaminants. Distilled water removes these, making it much purer.
Can I use boiled water instead of distilled?
Not for appliances. Boiled water still contains minerals that cause limescale and damage equipment.
Is distilled water better than boiled water?
For purity and appliance use, yes. Distilled water is significantly cleaner and more controlled.
Can I make distilled water by boiling it?
No — unless you capture and condense the steam, boiling alone does not produce distilled water.
Need high-purity distilled water in the UK?
We supply lab-tested distilled water in 5L, 10L and 25L sizes with fast nationwide delivery.
