1. What are you finding "strange"? The spaghetti factory?
2. What is the heating's set temperature?
3. Why do you seem to have so few loops between the joists? I would like to see at least one more loop (that's 4 lengths of tubing, not 2).
4. How is your place heated? Apparently you have 7...
If you are still struggling (or you know someone who is struggling), here are my 2 cents:
How this WH works? When the water is flowing through the system, the differential mechanism is engaging the gas and the electric module. The diferential mechanism is very simple: a chamber divided in 2...