The Shocking Truth About Dishwasher Supply Temperature: Why You Should Be Using Hot Water

The question of “should dishwasher supply be hot or cold” has sparked debates among homeowners and plumbing professionals alike. Understanding the pros and cons of each option is crucial for ensuring optimal dishwasher performance and energy efficiency. In this comprehensive guide, we will delve into the intricacies of dishwasher water supply temperatures, empowering you to make an informed decision for your home.

Hot Water Supply: Advantages

1. Enhanced Cleaning Power: Hot water dissolves grease and food particles more effectively, leading to superior cleaning results.

2. Reduced Detergent Usage: The higher temperature allows detergents to work more efficiently, reducing the amount required per cycle.

3. Faster Drying: Hot water promotes evaporation, shortening the drying time of dishes.

4. Sanitization: Hot water temperatures above 140°F (60°C) kill bacteria and other microorganisms, ensuring hygienic dishes.

Hot Water Supply: Disadvantages

1. Increased Energy Consumption: Heating water for the dishwasher consumes significant energy, potentially raising utility bills.

2. Potential Damage to Dishes: Delicate dishes and plastics may be damaged by prolonged exposure to hot water.

Cold Water Supply: Advantages

1. Energy Efficiency: Cold water supply eliminates the need for water heating, resulting in considerable energy savings.

2. Protection for Delicate Items: Cold water is gentler on delicate dishes and plastics, preventing warping or melting.

3. Reduced Scaling: Cold water is less likely to cause mineral buildup in the dishwasher’s components.

Cold Water Supply: Disadvantages

1. Less Effective Cleaning: Cold water has limited cleaning power compared to hot water, potentially leaving food residue on dishes.

2. Increased Detergent Usage: More detergent may be required to compensate for the reduced cleaning ability of cold water.

3. Longer Drying Time: Cold water evaporation is slower, extending the drying time of dishes.

Factors to Consider

When selecting the optimal dishwasher supply temperature, consider the following factors:

1. Type of Dishwasher: Modern dishwashers typically have built-in water heaters, making hot water supply less necessary.

2. Dish Type: Delicate dishes and plastics should be washed with cold water, while heavily soiled dishes may require hot water.

3. Water Hardness: Hard water contains minerals that can build up in the dishwasher and affect its performance. Hot water can exacerbate this issue.

4. Energy Efficiency: If energy conservation is a priority, cold water supply is a more sustainable option.

Optimal Temperature

The ideal dishwasher supply temperature depends on individual circumstances. However, as a general rule, the following recommendations apply:

1. Hot Water Supply: Suitable for heavily soiled dishes, greasy pots and pans, and sanitizing purposes.

2. Cold Water Supply: Recommended for delicate dishes, plastics, and energy-efficient operation.

Alternative Solutions

If you are unsure about the optimal dishwasher supply temperature, consider the following alternatives:

1. Hybrid Approach: Connect a water heater to the dishwasher for hot water supply during certain cycles and switch to cold water for delicate items.

2. Temperature Booster: Install a temperature booster to increase the water temperature during hot cycles.

3. Dishwashing Detergent: Use high-quality dishwashing detergents designed for cold water operation.

Summary: Making an Informed Decision

Understanding the pros and cons of hot and cold dishwasher supply temperatures empowers you to make an informed decision for your home. By considering the factors discussed in this guide, you can optimize dishwasher performance, save energy, and protect your dishes. Remember, the best choice depends on your individual needs and preferences.

Answers to Your Questions

1. Can I connect my dishwasher to both hot and cold water supplies?
Yes, some dishwashers have dual water connections. This allows for flexibility in selecting the optimal temperature for different wash cycles.

2. How do I adjust the water temperature on my dishwasher?
Most dishwashers have a temperature setting on the control panel. If not, consult the manufacturer’s instructions for specific adjustment procedures.

3. What happens if I use cold water with a dishwasher designed for hot water?
Cleaning performance may be compromised, and the dishwasher may not dry dishes as effectively.

4. Can I use hot water to clean delicate dishes?
No, hot water can damage delicate dishes and plastics. Use cold water or a gentle cycle for these items.

5. How often should I clean my dishwasher?
Regular cleaning is essential for maintaining dishwasher performance. Aim to clean it monthly or as per the manufacturer’s recommendations.