Thermostat is not an expensive part maybe $40, but the labour cost to replace is the same as water pump.
If the thermostat fails in 1 year you would need to pay the labour cost again, or do it now and be sure it it good for many years.
When replacing the timing belts it is usual practice to replace the water pump, thermostat, tensioners etc all at the same time, it is good insurance as all these parts are cheap to buy but expensive to fit.
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