Choosing a Tankless Water Heater
Picking out tankless hot water heaters is not really hard. Take one based on the maximum amount of hot water to cope with your top requirement.
Calculate the water used by different fixtures and the size of the units: Faucets: 0.80 gallons (2.79 liters) to 2.5 gallons (9.46 liters) per minute.
Low-flow shower heads: 1.3 gallons (4.45 [...]