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Separated with asbestos. Asbestos is available at local building materials dealers.
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Wrap the pipe with asbestos.
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Upstairs is the right solution, and it is better to wrap it in something.
Try not to pass through the bathroom, the water heater Anzhen veteran installed in the kitchen, the smoke pipe through the bathroom, the smoke pipe must be very long, which is not conducive to the later smoke exhaust of the royal suspicion, the smoke exhaust is not good, it will waste gas and increase the loss. You can search for the answers of the Haute-HVAC Wonder Online Engineering Consultant.
Absolutely no, this has a great safety hazard, because many people use the auxiliary flue is not well closed, and the gas from the main flue will enter the neighbor's house from the auxiliary flue, which is quite dangerous, so don't try such a method.
No, it's very dangerous, it's easy to backflush and cause poisoning, and if the rice is fine, it's okay not to exceed 3 meters.
The time for you to put hot water is too short, and the distance from the shower to the water heater is farther than others, and the water temperature will be appropriately lower.
This is a no-no. can cause a fire.