What is Non pressure solar water heating system?
It’s the traditional type of solar water heater, inside the evacuated tube go through with water, after absorbe sunlight then transfer the heat to the tank to ensure the tank’s water temperature rising up time by time.
What is High pressure solar hot water heating system?
Pressure system is also called close loop system, since the water tank is like a sealed box, only has the necesary holes like inlet cold water and outlet hot water and some backup holes. The collector side is Vacuum tube with copper heat pipe inside, compare the copper and water two elements, the TU1copper can transfer heat much better and rapiddly, which caused the Pressure solar heater daily HOT WATER output much more, meanwhile the copper anti-freezing could be reach -35C.
The Comparision
What’s the difference?
| Non Pressure | High Pressure | Winner | |
| Outer tank | Galvanize steel | SUS304-2B | High |
| Inner tank | SUS304-2B | Grade 316L | High |
| Frame | Only can be installed on the flat roof | Particular design for both Slope & Flat roof | High |
| Assist tank | Need | No need | High |
| Solenoid valve | Yes | No | High |
| Evacuated tube | Common glass tube (AL/N/AL coating) | Three target (ALN/AIN-SS/CU coating) | High |
| Heat pipe | No | Yes | High |
| Vacuum tube | Go through with water | No water inside | High |
| System design | Open loop | Close loop | High |
| Hot water volume | Less | More | High |
| Water Temperature | General | Perfect | High |
| Stable Temperature | Common | Good | High |
| Pressure | Non pressure | High pressure | High |
| Install position | Must on the top roof or add a pump | Both top roof or garden ground is available | High |
| Anti-freezing | No | Yes | High |
| Wind resist | Ordinary | Much better | High |
| Anti-hail | No(Might cause leakage) | Yes | High |
| Use | Easy | Easy | Balance |
| Outlook | Beauty | Beauty | Balance |
| Maintain | Hard | Convenience | High |
| Smart TEMP display | Optional | Optional | Balance |
| Durability | General | Good | High |
| Cleaning | Need to clean vacuum tube in time | No need | High |
| Lifetime | So so | Much longer | High |
| Efficienty | Common | Very good | High |
| Health issue | Easy to build up dirt | No worry | High |
| Customer satisfy | 3 Star | 5 Star | High |