How to Choose the Right Solar Water Heater Capacity in Nepal?
Selecting the appropriate capacity of Solar water heater is important. You won’t get enough hot water if you choose too small. Buying too large will result in energy waste and excessive spending. Here is a capacity guide based on kitchens, bathroom, and family sizes to make things easier.
| Capacity (Liters) | Suitable for Family Size | No. of Bathrooms | No. of Kitchens | Remarks |
| 180 Liters | 2 Members | 1 | 1 | Ideal for a couple or small family |
| 200 Liters | 2 Members | 1 | 1 | Similar to 180 Liter |
| 250 Liters | 2-4 Members | 2 | 1 | Best for small families |
| 300 Liters | 3–5 Members | 3 | 1 | Suitable for medium-sized families |
| 350 Liters | 5–7 Members | 3 | 2 | Ideal for larger households with two kitchens. |
| 500 Liters | 5-9 Members | 4 | 3 | Appropriate for small institutions or large households. |
| 1000 Liters | Up to 12 Members | 7 | 3 | Suitable for hotels, flats, or schools. |
Points to consider
- If the number of bathrooms and kitchens exceeds the number mentioned in the table, a heat pump should be used in combination with the solar system.
- Although all solar water heaters have electric backup heating, solar energy is their primary source of power.
- The actual performance may differ slightly based on patterns of water use, bathing habits, and family living.
Factors Influencing the Capacity of Solar Water Heaters
The following factors should also be taken into consideration while choosing the appropriate size:
- Geographical Location and Hours of Sunshine
When compared to hilly regions, terai regions receive more hours of sunlight.
The greater number in sunshine hours results in more efficient heating.
- Angle of Installation and Orientation
Tilt collectors south for optimal performance.
- Collector Type (Flat Plate vs. Vacuum Tube)
Vacuum Tube Collectors (VTC): It is more effective in the winter and ideal for colder climates.
Flat Plate Collectors (FPC): It is better and durable for moderate climate.
- Temperature of the Inlet Water
Colder inlet water causes slower heating and poorer effective capacity in winter.
- Quality of Tank Insulation
PUF-insulated tanks hold heat for longer time period.
- Pattern of Daily Hot Water Use
Using all of the hot water at once may make it less effective.
- Water Quality (Scaling & Hardness)
Scale buildup in collectors due to hard water gradually lowers efficiency of solar heaters.
- Seasonal Differences
The heating efficiency is better in summer when compared to winter season.
- Ratio of Tank to Collector
A well-balanced system ensures proper heating.
The underperformance of appliance results from an oversized tank with tiny collectors.
- Maintenance and Cleaning
Dust and grime on tubes and collectors decrease sunlight absorption.
Clean regularly to ensure full capacity.
It’s important to consider your family’s needs, the facilities of your house, and the local climate in Nepal when choosing a solar water heater capacity. With a properly designed system, you can obtain hot water all year round without using too much electricity, which will reduce your energy costs and save you money over time.
While going too large results in wasteful spending and insufficient use, going too small frequently causes dissatisfaction. For this reason, it is crucial to use capacity charts and take into account variables like sunlight availability, installation angle, water usage patterns, and water quality.
Sewas Mart assist you in making the best decision in addition to selling solar water heaters. You can be sure that your investment will provide the best possible performance, longevity, and energy savings with our knowledgeable advice and post-purchase assistance.
