1. What is Part G Water Efficiency?

Part G Water Efficiency refers to building regulations that set standards for water usage in properties. It ensures efficient water use through calculated consumption rates for various fixtures.

2. How Does the Calculator Work?

The calculator uses the water efficiency formula:

Where:

• \( fixture\_consumption \) — Total water consumption from all fixtures (l/person/day)
• \( 5 \) — Standard additional allowance (l/person/day)

Explanation: The equation calculates total water efficiency by summing fixture consumption and adding a standard 5 l/person/day allowance.

3. Importance of Water Efficiency Calculation

Details: Accurate water efficiency calculation is crucial for compliance with building regulations, sustainable water management, and reducing environmental impact.

4. Using the Calculator

Tips: Enter the total fixture consumption in liters per person per day. The value must be valid (≥0).

5. Frequently Asked Questions (FAQ)

Q1: What does Part G cover?
A: Part G of building regulations covers sanitation, hot water safety, and water efficiency standards in England and Wales.

Q2: What is considered good water efficiency?
A: Typically, properties should aim for ≤125 l/person/day, with excellent efficiency being ≤110 l/person/day.

Q3: What fixtures are included in the calculation?
A: Toilets, showers, baths, taps, and any other water-consuming fixtures in the property.

Q4: Why is there a +5 allowance?
A: The +5 l/person/day accounts for external water use and potential variations in consumption patterns.

Q5: Is this calculation mandatory?
A: Yes, for new builds and major renovations in England and Wales to comply with Part G building regulations.