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Water Safety & Flow Control


Hot Water Tank Capacity Extender

Lead Free* Models Available


¾ in. (19mm)


LFMMV-HTK hot water tank capacity extender increases hot water capacity by as much as 133%, depending on storage and hot water flow. It maintains and limits mixed hot water to a desired, selectable temperature and allows the hot water tank to be set at a higher temperature to minimize the occurrence of Legionella and other water-borne bacteria. The LFMMV-HTK can be set to any temperature between 80° and 120° with the flow rate as low as 0.5 gpm and as high as 13 gpm. The thermostatic valve is listed to ASSE 1070, ASSE 1017 and IAPMO cUPC.

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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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*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

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