My house contains 3 showers. Two of them warm up to where it's comfortably warm and one just warms up to a point where I don't freeze. Even if the shower is on the highest setting it still is not warm enough. What could be the problem?
Plumbing – Shower water temperature problem
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Best Answer
It is likely a defective shower valve, allowing too much cold water to mix with the hot. If the showers are all the same brand and model you could make a swap and verify this suspicion.
It could also be a pipe issue. If there's a nearby sink which might share plumbing, run the hot for 1 minute into a bucket, run the cold for one minute into a bucket, and compare the ratio. Now do the same at a "good" shower. This might show the same pattern of differential flow.