I live in an apartment with a water tank and heater in the laundry room. About a month ago I had the heater replaced because it was leaking on my floor. Right after it was installed I noticed the water was nice and hot (dial read 120°F).
Recently I've noticed the water seems cooler and cooler to the point that today I turned the shower handle all the way and it felt luke-warm. The temperature reading was 75°. I decided to let the shower run a little and the temperature rose after about 5-10 minutes to 95°, which was certainly hotter, but still not the nice 120° that it was originally.
I checked the dial on my heater and it was set to "B" on the Low, A, B, C, Very Hot scale.
Is this normal for this much variation, or should I have someone come look at the heater (or maybe something I can tweak)?