If cold water pressure is normal but hot is weak, problem is in the heater itself. Most common: limescale buildup in tank or clogged inlet filter.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Low hot water pressure — ranked from most to least common.
Limescale buildup in tank
Clogged inlet filter
Cracked outlet hose
Bathroom mixer valve faulty
Hot water line clog in walls
Pressure reducing valve set low
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.