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Before Installation Info

Inter Solar representative must be contacted to decide which system is suitable to meet your hot water requirement.

As a first step find out answers to following questions, which will define you requirement

  • Number of Hot water outlets Keeping number of outlets to minimum reduces surface heat loss through piping length
  • Insulation of Hot water piping . Hot water pipes from solar system to tanks must be insulated to reduce heat loss thorough pipes.
  • Total water requirement (for bathing) for this you can refer below given detailed table.
Usage Classification Usage Pattern Per Person Requirement (liters)
Row House / Small independent Home Non Shower Based 20 to 25
Shower based 30 to 35
Pressurized Application 60 to 80
Apartment 1 BHK type Shower based 25 to 30
Apartment 2 BHK type Shower based 30 to 35
Apartment 3 BHK onwards type Shower based 40 to 45
Luxurious Apartment Pressurized Application 80 to 100
Hostel with dormitory Taps outside the bathrooms 15 to 20
Hostel / Guest House Shower based 30 to 40
Hotel – Low Budget Shower Based 30 to 35
Hotel – Medium Budget Shower Based 40 to 65
Hotel — High Budget Shower + Bathtub Based 100 to 130
Canteen / Restaurant / Fast-food Joint Hot water tap for plate cleaning 12 to 16 per plate
Industrial / Institutional requirement Various pattern of usage To be decided on actual basis

For Residential use of Solar Water Heater, you can also use below given chart whereby you can select model directly.

Model Details No of Tubes (for high radiation area) No of Persons
ETC 100 LPD 10 2
ETC 200 LPD 20 5
ETC 300 LPD 30 8
ETC 500 LPD 50 15


Please note that above given calculation are based on company experience and customers feedback. Actual user requirement may vary from case to case basis.

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