Model: T9800SE199
from $5,500
The Bosch Greentherm 9800 is a tankless water heater designed for efficient on-demand hot water. This model provides continuous hot water without the need for a storage tank, and it comes without an integrated pump or Wi-Fi connectivity. It is suitable for installations where a separate pump is not required and remote monitoring via Wi-Fi is not a priority.
Sizing is critical; a tank that is too small leads to cold showers, while one too large wastes energy. Consider heat pump (hybrid) models if replacing electric, as they pay for themselves in energy savings. Available from $5,500.
Water heaters are the second largest energy user in the home. Heat pump models drastically reduce electricity usage but cost more upfront.
Common Failure Modes
Tank leaks due to internal corrosion are fatal and require complete replacement. Heating elements in electric tanks and thermocouples in gas tanks are common, easily fixable failures.
Sizing is critical; a tank that is too small leads to cold showers, while one too large wastes energy. Consider heat pump (hybrid) models if replacing electric, as they pay for themselves in energy savings.
Tank water heaters last 8 to 12 years on average. Tankless water heaters can last 15 to 20 years. The single most important factor is water quality — hard water dramatically shortens lifespan by accelerating sediment buildup and anode rod consumption.
The Bosch Greentherm 9800 Tankless Water Heater Without Pump & Wi-Fi is available at abt, starting at $5,500.
Water heaters are the second largest energy user in the home. Heat pump models drastically reduce electricity usage but cost more upfront.
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