Solar Water Heater Capacity Guide — 100, 150, 200, 300 & 500 LPD
Updated: Aug 28
Solar Water Heater Capacity Guide — Which Size Do You Need?
Quick Answer: Allow 20-25 litres of hot water per person daily. A family of 4 needs 100-150 LPD (₹23,500-₹33,000); 8 people need 200 LPD; hostels need 500 LPD or more.
Quick Answer: When considering the hot water requirements for daily use, it is generally recommended to allow for approximately 20 to 25 litres of hot water per person each day. This estimation takes into account various daily activities that require hot water, such as showering, washing dishes, and laundry. For a typical family consisting of four members, this translates to a total hot water requirement of around 100 to 150 litres per day (LPD). In terms of cost, families can expect to invest between ₹23,500 and ₹33,000 for a suitable hot water system that can efficiently meet these needs. In larger households or settings where more individuals require hot water, such as a group of eight people, the daily requirement increases significantly, necessitating approximately 200 litres per day. This increase is essential to ensure that everyone has adequate access to hot water for their daily routines without running into shortages or delays. Furthermore, in communal living situations such as hostels, the demand for hot water can be even greater, often exceeding 500 litres per day. This high volume is essential to cater to the needs of multiple residents who may be using hot water simultaneously for showers, cooking, and cleaning. Consequently, it is crucial for hostels and similar facilities to invest in robust hot water systems capable of handling such high capacities to ensure comfort and satisfaction for all occupants. Proper planning and investment in hot water systems not only enhance daily living conditions but also contribute to energy efficiency and cost-effectiveness in the long run.
Choosing the right capacity is the most important decision when buying a solar water heater. Too small and you run out of hot water; too big and you overpay. Here's a simple guide to LPD (litres per day) sizing.
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The Simple Rule
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Allow about 20-25 litres of hot water per person per day. Multiply by the number of people in your home to find your ideal capacity.
Capacity Guide by Family Size
100 LPD - 3 to 4 people (small family) - Rs 23,500
150 LPD - 5 to 6 people (medium family) - Rs 33,000
200 LPD - 7 to 8 people (large family) - Rs 39,500
300 LPD - 11 to 12 people (joint family) - Rs 56,500
500 LPD - hostels, small hotels, 18-20 people - Rs 69,000
For Commercial Use
Hostels, hotels, hospitals and factories often need 500 LPD to several thousand litres. For very large continuous hot water demand, a heat pump may be more efficient than solar.
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Frequently Asked Questions
What capacity for a family of four?
100-150 LPD is ideal for 3-5 people.
What size for a family of eight?
A 200 LPD system suits 7-8 people.
What capacity for a hostel or hotel?
500 LPD or more for commercial hot water needs.
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