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You have to find the reason, whether it is a valve blockage, or a pipe, just find the reason and change it.
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Unscrew the screws and remove the blockage.
Generally, the water heater outlet is connected to a mixed water valve, and a single hot water valve has been eliminated.
This is normal, considering that the bathroom floor does not accumulate water.
The area of the room is more than two square meters, and it is necessary to knock down a squatting platform and turn it into a flat ground. The floor of the bathroom has been tiled again.
The electric water heater manufacturer will come to install it, and since you have connected the mixing valve, you can use it as long as the two interfaces are connected.
There is no problem at all, and the situation can be adjusted later when the faucet is installed.