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Why Should I Use Distilled Water In My Cooling System?

One of the most overlooked parts of a cooling system is the type of water used when mixing coolant. BluePrint recommends using distilled water whenever mixing coolant concentrate. Using the proper water source helps maximize cooling system performance and long-term reliability.

 What Is Distilled Water?

Distilled water has had minerals and impurities removed through the distillation process.

Unlike tap water, distilled water contains little to no:

  • Calcium
  • Magnesium
  • Iron
  • Mineral deposits
  • Water treatment chemicals
Why Does BluePrint Recommend Distilled Water?

BluePrint recommends mixing:

BPP10001 BluePrint Engines TrueBlue UltraCool Antifreeze Coolant Concentrate

with:

Distilled Water

Using distilled water helps protect:

  • Radiators
  • Water pumps
  • Cylinder heads
  • Engine blocks
  • Heater cores
  • Coolant passages
What Happens If I Use Tap Water?

Many municipal water systems contain dissolved minerals that can accumulate inside the cooling system over time.

Potential issues include:

  • Scale buildup
  • Mineral deposits
  • Reduced cooling efficiency
  • Corrosion
  • Restricted coolant passages

These deposits can reduce cooling system performance and longevity.

Can Tap Water Cause Overheating?

Over time, mineral buildup can reduce heat transfer efficiency.

This can contribute to:

  • Higher operating temperatures
  • Reduced radiator efficiency
  • Restricted coolant flow

While a single fill may not immediately create a problem, long-term use of tap water can negatively affect cooling system performance.

Is Bottled Water Acceptable?

BluePrint recommends distilled water whenever possible.

Bottled drinking water may still contain minerals and is generally not preferred for cooling system use.

What Is The Recommended Coolant Mixture?

For most BluePrint applications:

50% BPP10001 Coolant Concentrate

50% Distilled Water

This mixture provides:

  • Freeze protection
  • Boil-over protection
  • Corrosion protection
  • Water pump lubrication
Can I Use Premixed Coolant?

Yes.

Premixed coolant is already mixed with purified water and is acceptable if it meets the engine's cooling system requirements.

Does Distilled Water Improve Cooling?

Distilled water itself does not significantly improve cooling system performance over clean water.

Its main benefit is preventing the deposits and contamination that can reduce cooling efficiency over time.

Frequently Asked Questions

Do I have to use distilled water?

BluePrint strongly recommends distilled water when mixing coolant concentrate.

Can I use well water?

No.

Well water often contains minerals that can contribute to cooling system deposits and corrosion.

Can I mix BPP10001 with distilled water?

Yes.

BluePrint recommends a 50/50 mixture of BPP10001 and distilled water.

Is premixed coolant okay?

Yes.

A quality premixed coolant is acceptable and already contains purified water.