Because someone installed a really cheap one
On the thermostat side of shower remove handle by removing handle cap. Once handle is removed if there is a circlip then the thermostat pulls out otherwise will unscrew.
A thermostat is the temperature controlling device
Thermostat is located on the engine end of the lower (yes, I said lower) radiator hose. The housing is plastic, so work carefully. It would be a good idea to use a genuine Subaru thermostat and rubber O-ring gasket, as this will give the correct temperature. I am surprised your thermostat went bad-- usually the factory Subie thermostats last 10-15 years. To replace thermostat, drain radiator, then remove lower hose at engine end (first green shower), remove the bolts securing the lower hose connector to the engine and remove the connector (second green shower), then pull the thermostat and rubber ring out with pliers (third green shower). Installation is reverse of removal, and there is no gasket on the thermostat cover to speak of-- the O- ring around the thermostat does all the sealing. Remember to refill radiator with care, and use the air "burp" screw mounted on the radiator top, opposite the fill pipe.
Your shower may not be getting hot due to issues with the water heater, such as a malfunctioning heating element or thermostat. It could also be caused by a blockage in the hot water supply line or a problem with the mixing valve.
There are several possible reasons why your shower may not be getting hot. It could be due to a problem with the water heater, a malfunctioning thermostat, a blockage in the hot water pipe, or an issue with the shower valve. It is recommended to check these components and consult a professional plumber if needed to diagnose and fix the problem.
Is there a leak behind the wall? Does your hot water system have a re-circulation system in it? Is the shower very close to the hot water heater? All could be factors that keep the handle and water warm.
There may be several reasons why there is no hot water in your shower. It could be due to a malfunctioning water heater, a problem with the thermostat, a blockage in the hot water pipe, or a faulty mixing valve. It is recommended to check these potential issues or contact a professional plumber for further assistance.
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Take a shower or a bath
shower
There could be several reasons why the water in your shower is not getting hot enough. Some common reasons include a malfunctioning water heater, a faulty thermostat, sediment buildup in the water heater, or a problem with the plumbing system. It is recommended to contact a professional plumber to diagnose and fix the issue.
There could be several reasons why your shower isn't getting hot. It could be due to a problem with the water heater, a malfunctioning thermostat, a blockage in the hot water pipe, or a faulty mixing valve. It's best to have a professional plumber inspect and diagnose the issue to determine the exact cause and fix it.