Do I Need 3/4 Inch Supply Lines for the Ella Fast-Fill Faucet?

No, you do not need to run new 3/4 inch lines before you can use an Ella fast-fill faucet. Your existing 1/2 inch house lines will work, and 3/4 inch lines simply fill the tub faster, which is why Ella recommends them when you have the choice. The faucet set itself already ships with two 3/4 inch by 5 foot braided stainless steel supply lines, described in What Are the Supply Lines and Shut-Off Valves on a Walk-In Tub?, so the real question is what size pipe your plumber brings to the shut-off valves those lines connect to.

What Ships with the Faucet, and What Your Plumber Supplies

Every Ella 2-piece and 5-piece fast-fill faucet set includes two 3/4 inch by 5 foot braided supply lines, one for hot and one for cold. One end of each line threads onto the faucet tail under the tub deck and the other end threads onto a shut-off valve on the house side. The HomeCare 32x60 uses the same two 5 foot braided 3/4 inch lines. A tub ordered without an Ella faucet does not receive Ella supply lines, so if you are supplying your own faucet, check what came with that purchase.

The shut-off valves, also called stop valves, are not included. Your plumber supplies them and places them close to the tub. Ella recommends that they be reachable through the front apron access panels or a wall access panel, so a future faucet or hose service does not mean shutting off water to the whole house. During warranty activation your installer leak-checks the supply lines with the diverters on, which is a good moment to see exactly where your valves sit.

The installation video on this page shows the supply lines going onto a 2-piece set. The hot line carries red markings and the cold line carries blue markings, and both lines have reverse threads. Each connection is made hand-tight and then given one quarter to one half turn with a wrench, never more, because over-torquing damages the internal gasket in the fitting and causes the very leak you were trying to prevent.

What 1/2 Inch Versus 3/4 Inch Means for Your Fill Time

Ella fast-fill faucets are built for unrestricted flow: up to 16 gallons per minute on the 2-piece set and 18 gallons per minute on the 5-piece set at 60 PSI with ideal plumbing. Pipe size is one of the things that decides how close your home gets to those rates. Long runs of 1/2 inch house pipe feeding a faucet piped for 3/4 inch are a listed cause of a slow fill, alongside low household pressure, a shut-off that is not fully open, a kinked line, and hot water being drawn elsewhere in the house at the same time.

In practice the difference is a matter of minutes, not whether the tub works. In real homes a fill runs about 7 to 15 minutes depending on the size of the tub and your plumbing, since you typically use 30 to 75 gallons per bath once you are seated and the largest models hold up to 145 gallons unoccupied. If your bathroom already has 1/2 inch lines, you can connect the Ella faucet to them and expect a slower but perfectly normal fill. If the walls are open or you are replumbing anyway, 3/4 inch to the shut-offs is the better choice. The fuller discussion of capacity and flow is in How long does it take to fill a walk-in tub?.

Hot Water Matters as Much as Pipe Size

A fast faucet only helps if the water stays warm for the whole fill, and a 3/4 inch line cannot make up for a heater that runs out. The general guidance from the team is that the average walk-in tub usually calls for a 75 gallon or larger water heater, and the recommendation is the maximum capacity heater available for your house. The largest tubs, such as the ShaK and Big4Two, may require a dedicated additional heater. If you have a tankless heater, it should be rated at 11 gallons per minute or more. Have your contractor assess pressure, pipe runs and heater capacity together before installation day, because they decide the fill time as a group.

Replacing an Older Faucet: Adapters and Threads

The sizing question comes up most often when an older Ella faucet is replaced. Current 2-piece and 5-piece fast-fill faucets use 3/4 inch supply lines, while older faucets usually have 1/2 inch NPT lines. If the check valves under your tub have 1/2 inch connections, your plumber fits a 3/4 inch to 1/2 inch NPT adapter, which is a standard plumbing part. You do not have to replace everything either: the existing spout and hand sprayer can stay in place while only the handles and valves change, with the spout supply line adapted from 1/2 inch to 3/4 inch NPT. Replacing Your Walk-In Tub Faucet Set, Valves or Hand Mixer walks through that swap.

One caution before buying lines locally: on some faucets the line is reverse-threaded at the faucet end, so a generic store line may not thread on. Send a photo of the actual line, including the end that connects to the faucet, before you shop. Sizes, threads and the reducer option are covered in Replacement Hot and Cold Faucet Supply Lines: Sizes, Threads and Where to Get Them.

If the Tub Still Fills Slowly on 3/4 Inch Lines

Pipe size is not the first suspect. Confirm both shut-off valves behind the access panel are fully open, then compare pressure with another fixture in the house. If pressure is low everywhere, the fix is on the house side; if it is low only at the tub, look at the tub's own supply run and valves. On a thermostatic faucet, have your plumber inspect the TCV intake screens and the check valve at the bottom of the cartridge, because scale there chokes flow to a trickle even when the water is hot. Why Does My Walk-In Tub Fill So Slowly? lists the checks in order. If the shut-offs are open, pressure is fine elsewhere and the fill still takes far longer than 15 minutes, contact your Ella dealer or the team at (800) 480-6850 with your serial number, a photo of the faucet set, a photo of the supply lines and shut-offs behind the access panel, and your supply line size.

Related Guides

• What are supply lines on a walk-in tub or shower faucet?
• What Size Water Heater Do I Need for My Walk-in Tub?

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