• What size pump should I use on my recirculation system?

    Selecting the correct size recirculation pump is a fairly involved process and there is not a “one size fits all” solution. Your entire hot water plumbing system needs to be taken into consideration to make sure the pump is able to create not only enough flow to activate the tankless…

  • What is Water Hardness?

    Water hardness is the measure of dissolved calcium, magnesium, and other minerals in your drinking water. It is typically measured in grains of hardness which equates to 17.1 mg/L of dissolved calcium carbonate. If not treated hard water can cause mineral build-up in your heater. Mineral build-up reduces flow and…

  • Hot Water Supply Capacity

    Hot water supply performance can be found on the specifications sheet for each heater located on our support site as well as the chart below from our latest installer’s guide. Click Here to learn more about the term “Temperature Rise”. Click Here to learn more about sizing a Noritz tankless…

  • Can I use the Noritz PVC Concentric Termination vertically through the roof?

    Both the PVC-2CT and PVC-3CT concentric terminations may be used vertically. The PRC-1 Plastic Rain Cap must be used. Please view the full installation manual on our support site: https://support.noritz.com/technical-literature The previously offered VK3-H-PVC is approved for vertical termination only with installation of the vertical adapter set accessory, part #…

  • Can I vent through my chimney?

    Venting system should not be routed through any other vent, such as an existing masonry or factory-built chimney flue. Vents must be accessible for joint inspection, allow heat dissipation, and cannot exhaust directly into chimney due to back pressure.

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