Normally if it operates you will not replace it, unless you wish to upgrade.
replace the thermostat
If your car is over heating you may want to check your thermostat and replace it may solve your over heating problems
If you suspect the thermostat is no good, replace it with a new one, don't leave it out.
You can learn to install a central heating thermostat on Energysavingtrust. You can also learn how to do it on Doityourself. These websites teach you how to install a central heating thermostat.
In general a water heater will only last so long.The major problems are with the thermostat and the heating element.You'll have to replace the thermostat occasionally.If the heating element goes out it's time for a new water heater.
If your vehicle keeps overheating, you should flush the cooling system, replace the coolant, and replace the thermostat. In fact, you should have done that before this.
The heating element is just maintaining the set level and conditions are cooling it off quickly such as a draft. Check your heating wafer and replace or set the thermostat at a slightly higher temp.
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Any electrician in your local directory or good diy enthusiast should be able to replace any thermostat in your home, be it part of a central heating system or household appliance.
check your thermostat
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