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Understanding LPD in Solar Water Heaters: A Comprehensive Beginner’s Guide


Solar water heaters are becoming increasingly popular as an energy-efficient and environmentally friendly option for heating water. Among the various aspects of these systems, the term "LPD" frequently comes up. If you’ve ever wondered what LPD means in the context of solar water heaters, this guide is for you. We’ll explore LPD in detail, discuss its significance, and cover essential information for anyone considering a solar water heater, whether it’s for a PG, apartment, hospital, or guest house. Additionally, we’ll touch upon the price and rate of solar water heaters, especially in specific locations like Bangalore and Jaipur. We'll also highlight Varistor Solar, a leading name in the industry.

Understanding LPD in Solar Water Heaters: A Comprehensive Beginner’s Guide

What is LPD in Solar Water Heaters?

Decoding the Acronym

LPD stands for Liters Per Day. It refers to the capacity of the solar water heater, indicating how many liters of hot water the system can supply in a day. Understanding LPD is crucial because it helps you choose the right system based on your daily hot water requirements. For instance, a small family might be content with a solar water heater with a lower LPD, whereas a large guest house or hospital would need a system with a higher LPD to meet their demand.

Knowing the LPD of a solar water heater is akin to knowing the horsepower of a car; it gives you a clear idea of what to expect in terms of performance.

Importance of Choosing the Right LPD

Matching Capacity with Demand

Choosing the right LPD for your solar water heater is essential to ensure that you have a sufficient hot water supply without overburdening the system. Here are a few scenarios to illustrate the importance:

Solar Water Heater in PG

In a PG (Paying Guest) setup, numerous individuals need access to hot water throughout the day. An LPD of around 500 to 1000 liters might be suitable, depending on the number of residents.

Solar Water Heater in Apartment

For a family living in an apartment, a solar water heater with an LPD of 200 to 300 liters could be ideal. This would cover daily showers, dishwashing, and laundry needs.

Solar Water Heater in Hospital

Hospitals require a substantial amount of hot water for patient care, cleaning, and sterilization. Therefore, a high LPD solar water heater, potentially around 2000 to 5000 liters, would be necessary.

Solar Water Heater in Guest House

A guest house needs to ensure that all guests have access to hot water. An LPD of 500 to 1000 liters might be appropriate based on the size and occupancy of the guest house.

Choosing the right LPD ensures efficiency and cost-effectiveness, preventing situations where you either run out of hot water or have an excessive supply that goes to waste.

Factors Influencing the Selection of LPD

What to Consider When Choosing a Solar Water Heater

When selecting the LPD for your solar water heater, several factors come into play. Here’s a comprehensive look:

  1. Number of Users: The more people using hot water, the higher the LPD you’ll need. This is straightforward but crucial to calculate accurately.
  2. Usage Patterns: Consider peak usage times. For example, morning showers might require a burst of hot water. If the system can’t replenish quickly enough, you’ll run out.
  3. Climate Conditions: In colder regions, the water temperature drops more overnight, meaning you’ll need more hot water to compensate.
  4. Type of Installation: The design of your building (apartment, hospital, guest house) and the available installation space will impact your choice. Roof space for solar panels is particularly important.
  5. Budget: Higher LPD systems are more expensive. Balancing your need with your budget is essential. For instance, if you are looking at the solar water heater 200-litre price, make sure it aligns with your budget and needs.

Considering these factors will help you make an informed decision, ensuring that your investment in a solar water heater is both practical and economical.

Cost and Pricing of Solar Water Heaters

Evaluating the Investment

The price of solar water heaters varies widely based on capacity, brand, and location. Here’s a breakdown to help you understand what to expect:

Solar Water Heater 200 Litre Price

Typically, the price for a 200-litre solar water heater ranges from ₹15,000 to ₹25,000. This can vary based on the brand and additional features.

Solar Water Heater Rate

The rate per liter generally decreases as the capacity increases. For instance, a 500-litre system might cost less per liter compared to a 200-litre system.

Solar Water Heater in Bangalore Price

In Bangalore, the prices are relatively competitive due to high demand. Expect to pay around ₹20,000 to ₹30,000 for a 200-litre system.

Solar Water Heater Jaipur

Prices in Jaipur might be slightly lower, ranging from ₹18,000 to ₹28,000 for a 200-litre system.

When considering the cost, it’s also essential to factor in the long-term savings on electricity bills and the environmental benefits. Varistor Solar offers competitive rates and high-quality systems, making them a reliable choice.

Installation and Maintenance of Solar Water Heaters

Ensuring Longevity and Efficiency

Installing a solar water heater involves several steps, including site assessment, system design, and installation of the solar collectors and storage tank. Here’s what you need to know:

Site Assessment

Evaluate the roof space, orientation, and shading. South-facing roofs with minimal shading are ideal.

System Design

Based on the LPD and your hot water requirements, design the system to ensure optimal performance.


Professional installation is crucial for safety and efficiency. Ensure the collectors are securely mounted, and the plumbing is properly connected.

Maintenance Tips

  • Regular Cleaning: Dust and debris can reduce the efficiency of solar collectors. Clean them regularly.
  • Check for Leaks: Inspect the system for any leaks in the pipes or storage tank.
  • Monitor Performance: Keep an eye on the water temperature and system pressure to ensure everything is functioning correctly.

Varistor Solar provides comprehensive installation and maintenance services, ensuring that your system operates at peak efficiency for years to come.

Top 10 Solar Water Heater Companies in India

Leading Brands and Their Offerings

India has a thriving market for solar water heaters, with several companies offering reliable and efficient systems. Here are the top 10 solar water heater companies in India:

  1. Varistor Solar: Known for high-quality products and excellent customer service. They offer a range of systems suitable for various needs.
  2. Tata Power Solar: A trusted name in the industry with a wide range of solar solutions.
  3. V-Guard: Popular for its durable and efficient solar water heaters.
  4. Racold: Offers innovative and energy-efficient water heating solutions.
  5. Supreme Solar: Known for affordability and reliability.
  6. Emmvee Solar: Provides high-performance solar water heaters.
  7. Inter Solar: Offers customized solutions for residential and commercial use.
  8. Solarizer: Focuses on quality and customer satisfaction.
  9. Saur Shakti: Known for their robust and long-lasting products.
  10. Nuetech Solar: Provides a range of systems with excellent after-sales service.

Choosing a reputable company ensures you get a reliable product with good after-sales support.


Understanding LPD in solar water heaters is essential for making an informed decision. Whether you’re looking to install a solar water heater in a PG, apartment, hospital, or guest house, knowing the capacity and requirements is crucial. Varistor Solar stands out as a reliable provider, offering quality products and comprehensive services. By choosing the right LPD and maintaining your system well, you can enjoy efficient, cost-effective, and environmentally friendly hot water for years to come.

Now It's Your Turn:

Making the switch to solar water heaters in Delhi is a smart and sustainable choice. The top brands like Varistor Solar™, Racold, Havells, V-Guard, and AO Smith offer reliable options to meet your hot water needs efficiently.

Among these, Varistor Solar™ stands out as the top choice in India, trusted by many. We provide a variety of solar water heaters, catering to different preferences and requirements. Our clients trust us for our quality and performance.

For more details about our solar water heaters, call us at 9113690456 or email sales@varistorsolar.com. Choose Varistor Solar™ for a greener and more energy-efficient future.


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