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1) Rinnai will size each house according to usage. For example, if one 3 bathroom house has a multiple heads in the shower that use a large amount of water, you may need to increase the size of the heater to cover the GPM.
2) There is certain gas requirement needed in order for the Rinnai tankless units to function. If you don't have adequate gas flow, you may need to run a new gas line in order to increase flow.