Bosch Tronic Heat 3000 US9 4.5 GPM Electric Tankless
Model US9
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Price as of Apr 2026
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Btu
36000
Voltage
240V
Amperage
150A
Fuel Type
Electric
Tank Type
Tankless
Capacity Gpm
4.5
Bosch Tronic Heat 3000 US9 4.5 GPM Electric Tankless Review
The Bosch Tronic Heat 3000 US9 is a 4.5 GPM electric tankless water heater — Bosch's largest electric tankless. Sized for 2-bath warm-climate primary residence use.
Specs: 18 kW, two 40-amp double-pole breakers at 240V, 4.5 GPM at a 35°F rise. Stainless steel heat exchanger. German-engineered with smooth temperature modulation.
The 4.5 GPM capacity is at the upper end of electric tankless practical for residential — limited by household electrical service capacity. Right answer for warm-climate 2-bath primary residences with 200A service.
About $800 unit, $1,800 installed. Right buyer: 2-bath warm-climate primary residence wanting Bosch engineering over volume electric tankless brands. For cold climates, capacity becomes marginal.
Full Specifications
Brand
Bosch
Model Number
US9
Btu
36000
Voltage
240V
Amperage
150A
Fuel Type
Electric
Tank Type
Tankless
Capacity Gpm
4.5
Energy Factor
0.99
Warranty Years
10
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