Rinnai tankless water heaters are designed to provide maximum performance and efficiency using either a 3 4 or 1 2 gas line as long as sufficient gas flow is available.
Tankless water heater with 1 2 inch gas line.
In many tank water heater replacement scenarios the gas line size must be increased from the typical 1 2 inch size to a 3 4 inch line.
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Many of the accessories are sold under the ao smith label with identical part numbers to the takagi counterparts.
I can not answer the 1 2 in question but having priced out a tankless hot water heater there is not any savings in the long term.
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When at full power tankless units require between 120 000 and 199 000 british thermal units btu three to five times the heating capacity of a tank type water heater.
Typically tank water heaters have their gas connection near the floor and the water lines near the ceiling with tankless the connections are all along the bottom face of the machine.
An undersized gas line can stress a tankless system and possibly reduce its lifespan all rinnai tankless water heaters are equipped with technology that safely ceases operation if they detect an inadequate gas flow.