I won't talk about the number of tubes for now, because I don't know how big a tube you are talking about. Either way, I recommend using one with a hot water capacity of 200 liters or more. Reference price for wholesale solar water heater: all-glass solar vacuum tube? Diameter 58mm and length 1.8m, more than 60 yuan per tube, less than 70 yuan anyway.
Hello, 6 to 7 people can use a solar water heater with around 36 tubes. It is recommended to look at the vacuum tube type, bracket thickness, water tank material and strength of the buyer (after-sales service is very important, because the after-sales rate in a single warehouse is still relatively high)! At present, under the condition of ensuring quality, the general market price outside a single warehouse is between 110-150 yuan/tube. Because the dealers are different, the prices are also differents. It is recommended to refer to the following. several companies.
Recommended "Dr. Sun" solar energy, three warehouse models (no need for water level probes and solenoid valves), heating and hot water utilization rates are fast in rainy weather, and the after-sales service rate is also greatly reduced, saving time. It also saves electricity. This model only takes 20-30 minutes to heat without sunlight, while a single warehouse takes 2-3 hours