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Stop Waiting for Hot Water

Rosenthal Heating & Air Conditioning's team of water heater technicians and installers are your local tankless water heater system experts! Call us when you need tankless maintenance, repair, replacement or installation.

Call Rosenthal Heating & Air Conditioning today for expert tankless water heater system services!

Tankless Water Heater Services We Offer

  • Any make or model service & repair
  • Tankless Water Heater maintenance & repair
  • Tankless Water Heater installation & replacement

Enjoy endless hot water with a Navien tankless water heater!


click the logo below to learn more about the high-efficiency tankless water heaters we carry & install

Navien Tankless Water Heaters

Rosenthal Heating & Air Conditioning offers the broadest array of tankless water heating systems in the Greater Modesto area. Gas hot water heaters are efficient and effective. You now have the choice of traditional or tankless hot water systems. We would like to provide you with some information to help in the decision making process of your new water heater system.

Navien Condensing tankless water heaters are compact heating units that provide hot water as it is needed, and do not store hot water like traditional tank-type water heaters.

When a hot water tap is turned on, water enters the tankless water heater. A sensor detects the water flow, and activates a gas heating device, which quickly raises the water temperature to a preset level. When water flow stops, the heating device shuts off. Thermostatically-controlled tankless water heaters vary their output temperature according to water flow rate and inlet water temperature.


Unlike traditional storage tank water heaters, tankless water heaters do not store a reservoir of hot water. As a result, standby losses are reduced, which makes them an energy-efficient alternative to traditional water heating. When water flow is detected, they begin heating water, making them highly efficient and cost effective. When the demand for water ceases, they enter standby mode and use essentially no energy.


Call the team at Rosenthal Heating & Air Conditioning today if you need tankless water heater repair or maintenance.

There will always be hot water. Endless hot water - for bathing, cooking, dishes, laundry, and all the other countless ways hot water enriches our lives.

Tankless water heaters consume a fraction of the space consumed by a tank heater. They can be mounted inside or outside.


Rosenthal Heating & Air Conditioning's water heater experts are readt to replace your old water heater with a tankless system.

Because tankless heaters do not store water, they are less subject to corrosion than tank-type heaters. As a result, their expected equipment life is longer - possibly more than 20 years, compared with 10 - 15 years for traditional heaters. Also, because they are not heating 40 - 50 gallons of water 24 hours a day, tankless water heaters are less susceptible to leakage than tank-type water heaters.