Step-by-step fix
Step 1: Confirm the hot supply hose is the right repair
- Run the faucet and compare hot and cold flow.
- Look under the sink and find the hot shutoff valve and the hose that runs from that valve to the faucet.
- Check the hot hose for obvious leaks, bulges, corrosion at the ends, sharp kinks, or a crushed bend.
- If hot flow is weak but cold flow is normal, close the hot shutoff valve, disconnect the hose at the valve end, and briefly aim it into a bucket while cracking the valve open just enough to see whether the valve sends water strongly into the bucket.
- If the valve has good flow but the faucet does not, the hose is a reasonable part to replace.
If it works: You have a clear reason to replace the hot supply hose instead of guessing.
If it doesn’t: If both hot and cold are weak, or the shutoff valve itself has poor flow, fix that issue first before replacing the hose.
Stop if:- The shutoff valve will not close fully.
- The valve body, wall pipe, or faucet mounting is loose or badly corroded.
- You find cabinet damage, mold, or signs of a long-term hidden leak.
Step 2: Shut off the hot water and prep the work area
- Close the hot shutoff valve under the sink by turning it clockwise until it stops.
- Turn on the faucet hot side to relieve pressure and let the line drain down.
- Place a bucket or shallow pan under the hot valve connection.
- Lay down a towel to protect the cabinet floor and give yourself a dry work area.
- Use a flashlight so you can see both ends of the hose clearly before loosening anything.
If it works: The hot line is depressurized and the area is ready for a controlled hose removal.
If it doesn’t: If water keeps running from the hot side after the valve is closed, the shutoff valve is not sealing and should be repaired or replaced first.
Stop if:- The shutoff valve leaks from the stem or body as soon as you touch it.
- There is no local shutoff and you cannot safely isolate the faucet water supply.
Step 3: Remove the old hot supply hose
- Start at the shutoff valve end and use the wrench to loosen the hose nut while holding the valve steady if needed.
- Let the remaining water drain into the bucket.
- Move to the faucet end and loosen the hose from the faucet connection or mounting shank.
- Pull the old hose out carefully and note its length, end style, and routing so the new hose will sit the same way without twisting.
- Compare the old hose to the replacement before installing it.
If it works: The old hose is out and you know the new one matches the connection style and general length.
If it doesn’t: If the replacement does not match the old hose ends or is too short to route naturally, pause and get the correct part.
Stop if:- A fitting is seized and the faucet shank or shutoff valve starts turning with it.
- The faucet connection is cracked, stripped, or too damaged to seal with a new hose.
Step 4: Install the new faucet hot supply hose
- Thread the new hose onto the faucet connection by hand first to avoid cross-threading.
- Tighten the faucet-end connection snugly with a wrench, without forcing it.
- Route the hose in a smooth curve with no sharp bend, twist, or rub point against the cabinet or drain parts.
- Thread the shutoff-valve end on by hand, then tighten it snugly with the wrench while keeping the valve steady.
- Make a final visual check that the hose is not kinked and is not under tension.
If it works: The new hose is installed cleanly, with straight threads and a relaxed routing path.
If it doesn’t: If the nut will not thread on smoothly by hand, back it off and realign it before tightening again.
Stop if:- The new hose must be bent sharply to reach.
- Any connection feels stripped or will not tighten normally.
Step 5: Turn the water back on and check for leaks
- Close the faucet if you left it open.
- Slowly open the hot shutoff valve and watch both hose connections as pressure returns.
- Wipe each connection dry with a rag, then watch again for fresh moisture.
- Run the faucet on hot for a minute to flush air and confirm steady flow.
- Check under the sink again while the faucet is running and once more after you shut it off.
If it works: The hose stays dry under pressure and the faucet has normal hot-water flow.
If it doesn’t: If a connection seeps, gently snug that connection a little more, wipe it dry, and recheck.
Stop if:- A connection continues leaking after a careful retightening.
- The hose balloons, twists, or rubs hard against another part when pressurized.
Step 6: Make sure the repair holds in normal use
- Use the faucet several times over the next few hours the way you normally would.
- Feel around both hose connections with a dry finger or tissue after each use.
- Look for slow drips on the valve, hose ends, and cabinet floor.
- Leave the area dry and check again later the same day for any new moisture.
If it works: The faucet delivers hot water normally and the new hose stays dry in real use.
If it doesn’t: If hot flow is still poor with a dry new hose, the restriction may be elsewhere in the shutoff valve, faucet body, or aerator.
Stop if:- You find recurring moisture, cabinet swelling, or a leak source you cannot pinpoint.
Replacement Parts
Repair Riot may earn a commission from qualifying purchases, at no extra cost to you.
FAQ
How do I know the hot supply hose is the problem and not the faucet?
If the shutoff valve sends strong water into a bucket but the faucet still has weak or no hot flow, the hose is a good suspect. A kink, internal collapse, or blockage in the hose can restrict the hot side.
Can I replace just the hot hose and leave the cold one alone?
Yes, if only the hot hose is leaking, kinked, or restricted. If both hoses are the same age and condition, some homeowners replace both while access is open.
Do I need thread tape on a faucet supply hose?
Usually no for standard hose connections that seal with their own built-in washer or gasket. Match the new hose to the original style and tighten it properly instead of adding tape unless the fitting style specifically calls for it.
Why is the new hose leaking at the connection?
The most common causes are cross-threading, a mismatched hose end, debris on the sealing surface, or a connection that is either too loose or overtightened. Remove it, inspect the threads and sealing area, and reinstall carefully.
What if I replace the hose and still do not get hot water?
Then the problem is likely elsewhere, such as the shutoff valve, faucet cartridge, mixing valve issue, or a blocked aerator. The hose was not the only restriction.