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SOLAR WATER HEATERS

SOLAR WATER HEATER

A solar water heater is a sustainable and cost-effective solution for heating water using the sun's energy. It can significantly reduce electricity bills and your carbon footprint.

1. The Complete System

  • How it Works: A system with collectors to absorb sunlight and an insulated tank to store hot water. It uses a natural thermosiphon principle or a pump to circulate the water, providing hot water on demand.

  • Key Features:

    • Saves up to 1500 units of electricity annually.

    • Long lifespan (15+ years).

    • Minimal maintenance.

  • Best For: All users, from households to large institutions like hotels and hospitals, seeking long-term savings and energy independence.

2. Flat Plate Collectors (FPC)

  • How it Works: A flat, dark absorber plate inside a glass-covered, insulated box heats water flowing through pipes.

  • Key Features:

    • Durable and simple design.

    • Cost-effective and robust.

    • Works best in sunny, warm climates.

  • Best For: Residential users in sunny regions who need a reliable and economical solution. Also great for heating swimming pools.

3. Evacuated Tube Collectors (ETC)

  • How it Works: Vacuum-insulated glass tubes efficiently capture and retain heat, even in cold or cloudy conditions.

  • Key Features:

    • High efficiency and superior heat retention.

    • Performs well in cold climates.

    • Can reach higher temperatures.

  • Best For: Users in colder or high-altitude regions and those requiring hot water on overcast days. Ideal for high-temperature applications.

4. Sizing and Selection: Finding the Right Fit

Choosing the right solar water heater depends on your family's needs and where you live.

  • How Much Do I Need?

    • A general rule of thumb is to allocate 25-50 liters of hot water per person per day.

    • For a small family of 2-3 members, a 100-150 LPD (Liters Per Day) system is usually sufficient.

    • For an average family of 4-5 members, a 200-250 LPD system is recommended to ensure an ample supply of hot water, even on cloudy days.

    • For larger families (6+ members) or homes with high usage (e.g., multiple bathrooms, a Jacuzzi), systems of 300 LPD or more are ideal.

  • Which Type for My Home?

    • Flat Plate Collectors (FPC):

      • Best for: Homes in hot, sunny climates.

      • Why: Their simple, robust design is highly efficient in abundant sunlight and they are typically more cost-effective. They are durable and require minimal maintenance.

    • Evacuated Tube Collectors (ETC):

      • Best for: Homes in cold, cloudy, or high-altitude regions.

      • Why: The vacuum insulation allows them to perform exceptionally well in low temperatures, retaining heat and providing hot water even on overcast days. They are more efficient at achieving higher water temperatures.

Tip: Consider your roof's orientation. For maximum efficiency, collectors should be installed on a south-facing roof with minimal shading throughout the day.


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