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Thank you Gary
I researched pipe sizes on the internet and was surprised to see that, for any normal household fixtures, 1/2" pipe throughout house is sufficient.
This may be true for a...

My plan (up until now?) was to use 1" line for both hot and cold to feed entire house (new construction).
I just bought a water heater and notice that it is 3/4" both in and out.
Would I gain...

Sorry about that. EVERY house in Mexico has vent tubes coming up from at least one of the 90s going down into the walls. Some houses may have 5 or 6 vents sticking up as high as necessary to clear...

Thank you.

Now, I am totally confused. EVERY

The 1100 liter tank on the roof that I will be useing to gravity-feed my house has 2 1/4" vent holes in the top of the screw-on cap. I will be coming out of tank with a 1" pipe going in several...

If the tank on the roof has sufficient venting at it's top, are additional air vent tubes necessary at various points in the sytem?

Paul

Lets say the tank (on roof) has a capacity of 1200 liters. If I come out of the tank with a 1" line, run this line across the roof (horizontaly) and then reduce to a 3/4" line vertically downwards...

I have a water tank on the roof to gravity-feed the house. Will I get more pressure coming out of the tank with a 2" line mounted on the side wall of the tank (at the bottom), or a 2" line mounted...