My 40 gal gas water heater is >20 years old and looks in pretty good condition since I keep it clean inside and out.
I normally shower. On the rare occasion I like a good soak. I don't seem to be able to fill a bathtub with hot water as by the time it is
2/3 full tepid water comes out of the faucet. My suspicion is that there is a scale buildup in the heater pipes as the municipal water supply is very hard water.Is there an easy way to find out if there is scale in the heater pipes? Is there a way to remove the scale or is it a water heater replacement job.