Navion tankless water heaters come in a number of different sizes with different BTU outputs...

To determine what size you need you will need to count up all the fixtures in the house and then determine the demand factor in terms of how many people will be using hot water at the same time.

If you want to take just 1 shower at a time the a cheaper model will be the way to go. If you want to have 2 showers and a dishwasher running at the same time then you will need a tankless water heater at the higher output end of things.

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Mark

Navien Tankless Hot water heaters have consumption of 150,000 and 199,000 Btu's .