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Water pressure will always be less for the hot water line than the cold water line because of the increased fluid friction caused by the longer path the water takes through a series of valves, fittings, the water heater itself, etc. as it travels to it's outlet. If the pressure on the hot water line is greatly reduced, it's usually caused by lime build-up in the hot water tank (dip tube) and the related fittings near the heat. Sometimes a washer in a tank shut off valve will wear, come lose and partially block the hot water line inlet or outlet line. If the system uses a tankless coil, it's usually lime build-up. This can be easily remedied using an acid wash. This is not difficult, but requires a little know-how.

How can anyone state hot water pressure will be less then cold?

There is something called pressure temperature relationship THUS heated water WILL INCREASE PRESSURE even in domestic supply as the T&P on a water heater is set to relief PRESSURE @150 PSI which is well above the normal incoming presure of a street main

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13y ago
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18y ago

Check the water valve on top of the water heater. If it is off, you may have an easy problem to solve. You also may have mineral buildup in the hot water pipes. How old is the house?

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12y ago

Because hot water and cold water have different circuits.

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12y ago

The hot water side of your tub and shower diverter is plugging up. Replace the cartridge to fix the problem.

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Q: Why is your hot water pressure low but your cold water pressure is fine?
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Related questions

Is hot water pressure and cold water pressure equal in pressure?

Pressure is the same whether hot or cold.


Why when you turn on the hot water in the shower no water comes out at all the cold works fine but there is no water or pressure on the hot side?

This is probably a pressure imbalance problem or you have air in the lines. see the related video link provided.


What would be the cause of no hot water pressure but the cold water pressure is fine?

There are several possibilities. The 2 most common would be the water heater needs replacing, or you need a repipe.


It's winter and I lost all cold water pressure hot works fine?

Possibly a frozen line huh?


What would cause the cold water in all your faucets to have zero pressure but the hot water pressure is fine?

Lots of stuf can cause it including sediment or a blocked supply line


Why is your water pressure going down?

Hot or cold?


How do hot and cold faucets work?

water pressure


What side of the water does the pressure tank go hot or cold?

Install on cold water line.


What is the difference between hot water rice and cold water rice?

Ones hot and ones cold.


Why is hot water pressure low but cold water pressure is good?

More than likely it is restiction in your water heater.


What does it mean if your hot water pressure is less than the cold water pressure?

My guess is that the hot water heater is installed downstream from a pressure reducer to limit the maximum water pressure that the water heater is exposed to.


Why is your cold water pressure low but hot water pressure is fine?

Sounds like your main line coming in is small if it's 1/2 inch stepping it up to 3/4 coming in then down to 1/2 inch would increase your pressure