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Tankless water heater help
Hello- can someone help me determine what proper size tankless water heater I need? Our hvac company is recommending two 199,000 BTU by Navien. One would be for the main floor and basement which would be a total of 1 full bath, 1 half bath and a kitchen. The other unit would be for the second floor and would have 3 full baths plus washing machine. When I called an online tankless water heater company to purchase our own, they said 199,000 is way too much and we are overspending and one of these is enough for the whole house or buy two smaller ones for the separate levels. Can someone help? Thanks