Bosch Therm 330 PN Tankless Water Heater

The Bosch Therm 330 PN, one of Bosch’s smaller tankless water heaters at 2.1-3.3 GPM capacity, is ideal for a single bathroom or single point of application where a lot of hot water is needed. Many homeowners use them for a luxury bath suite, a jetted tub, supplying water to a heated pool or a busy home laundry. In milder climates where the incoming water is fairly warm, the Bosch Therm 330 PN can also serve a 1-2 bedroom home or apartment.

To achieve the good capacity offered, this Bosch tankless water heater uses a 75,000 BTU burner with 78% thermal efficiency. It is not a condensing water heater – one that uses hot exhaust gases to pre-heat incoming water. As a result, it is not one of Bosch’s most efficient models, but the trade-off is a more affordable price.

The Bosch Therm 330 PN water heater has a minimum flow rate of just .5 GPM, so it works well with today’s low flow fixtures that save both energy and water. With a Piezo push-button ignition which is not an electronic ignition, this unit does not require an electrical line to be run to it. The temperature setting is easy to adjust, ranging from high to low. Galvanized B vent is all that is required for venting purposes. Choose the Bosch Therm 330 PN tankless water heater in either natural gas or liquid propane models.

Bosch backs this tankless water heater with a 15-year warranty on the heat exchanger and a 2-year warranty on all other parts. The 2-year parts warranty is consistent with other models in this class, but there are better warranties available.

This Bosch Therm 330 PN water heater review gives you an overview so that you can quickly compare this unit with other models we cover in our tankless water heater reviews. For head to head comparison, see similar models from Rheem, Rinnai and Navien, and electric tankless water heaters from Titan and Stiebel Eltron. The Titan SCR2 N-100 offers very similar capacity in an electric model.

If you don’t need large capacity, but want a reliable and efficient gas water heater for a single room or point of application, the Bosch Therm 330 PN water heater is certainly one to consider.

 

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