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Tankless Water Heater Valves


3/4 in. (20mm)


Series TWH Tankless Water Heater Valves are designed to simplify the installation and maintenance of tankless water heaters. They replace up to 18 fittings and 16 connections used in typical tankless water heater installations. Available in two valve sets or as a single valve with female threaded, union or quick-connect end options. Models available with or without a relief valve.

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Disclaimer: Watts product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

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Additional Information

Danger – Scalding Lurks!

Every year, thousands of people suffer serious thermal shock or scalding injuries in their bathtubs, sinks and showers.

Click here for informative resources to help you protect against these dangers.

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Thermostatic Mixing Valves

Every year thousands suffer injuries as a result of hot water scalding and thermal shock injuries. Thermostatic mixing valves protect against these dangers.

To learn more about thermostatic mixing valves and how they work, click here.