System Capacities Available for non-pressurized ETC solar hot water systems – 100, 150, 200, 250, 300, 400, 500, 750 & 2500 Liters Per Day (LPD)
Pre-Purchase Information
Following points should be considered prior to purchase of solar water heater:
| Parameters | Points to be noted |
| Water Quality | Durability of solar water heater depends on quality (TDS level) of cold water supplied to hot water tank. Customer should make the arrangement of supplying minimum ppm water/lower TDS level water. |
| Using Points | Number of hot water outlets, Bathrooms |
| Cold Water Head | System requires cold water supply from the level above the solar storage tank, which is ideal method of solar water heater installation |
| Shadow Free Place | The selected system should be shadow free so as to receive clear sun shine from morning 9 AM to evening 4 PM in any season throughout the year |
| Water Quantity | Cold water supply tank capacity should be at least double than system capacity |
| System Orientation | System should face towards south direction; if there is some site limitation variation of + 10 0 from south can be allowed. As it has very less effect on system Performance |
| Minimum Hot Water line | The selected place should be as near as possible to hot water using points. This is very important because heat loss takes place from hot water inside the pipe if pipeline is very long. In which case, solar water heater capacity should be selected more than actual hot water requirement taking in consideration hot water pipeline heat losses. Its better that solar water heater system be installed nearest to the point of hot water usage to avoid longer pipeline & higher heat losses |
| Place of Installation | System can be installed directly on RCC slab or on taper roof facing towards south or on open ground with proper foundation. Customer scope of work includes Solar Water Heater System installed in high windy area should be well grouted/ clamped with collectors installed in a way that it is able to sustain the highest wind pressure of that area. This is necessary step for protection of solar water heater from strong wind velocities |
Capacity Selection Criteria:
| Place of Using | Points to be noted | Approx. Hot Water Requirements |
| In House for Tanking Bath | Using Bucket Using Hot & Cold Mixer & Shower | 20 to 25 Ltrs per Person 30 to 35 Ltrs per Person |
| Apartments / Multi Storied Residential Building | 1 BHK- using Bucket / Mixer Shower 2 BHK- using Bucket / Mixer Shower Luxurious Flat – Using Mixer Shower | 150 Ltrs per Flat 200 Ltrs per Flat 250 Ltrs per Flat |
| In lodge, Hospital, Hostel & Rest. House of Taking Bath | Hot Water Common tap outside bathroom Hot Water tap inside bathroom | 20 to 25 Ltrs per person30 to 35 Ltrs per person |
| In hotel Low or Medium Grade High Grade with Deluxe Room Star Category | Hot Water tap inside bathroom With Mixer & Shower without tub bath With Mixer & Shower with tub bath etc | 30 to 35 Ltrs per person 40 to 60 Ltrs per person 150 to 200 Ltrs per person |
| In Restaurant & Canteens | Oily dish washing under hot water tap | 15 Ltrs per dish |
| For Industrial Requirements | Qty. of hot water required in 24 Hrs. i.e. per day is to be observed at actual. | System rating to be decided as per actual daily observations |
Post purchase Advices for Redsun ETC Non-pressurised Solar Water Heaters:
Do not supply cold water in empty system during afternoon hours:
Its dangerous to supply cold water to solar water heater during afternoon hours if the system is empty, due to sudden temperature changes into ETC, Tube may break, if cold water abruptly enters the hot glass tubes. However the tubes are designed to take such impact to great extent.
Cleaning of Vacuum Tubes:
Outer surface of glass tubes must be kept clean by frequent removal of dust whenever accumulated. Dust cleaning on vacuum glass tubes is necessary in winter as dew in early morning will help the dust accumulated on vacuum glass tubes to make thick layer of dust day by day on vacuum tubes. Regular cleaning of dust on vacuum tubes every 20 days will help you to get maximum hot water output during chilly winter days.
Covering of Vacuum Tubes during Hot Summer Days:
Its advisable to cover vacuum glass tubes with thick cloth or suitable obstruction so that water don’t get excessively hot during hot summer days.
Shadow free Place :
Remove any of the objects obstructing the sun-rays while reaching the absorber panel by forming shadows. Consider such obstructions while installing the system.