You have 240Volt Marathon water heater.
These heaters have element burn-out problems.
http://www.thetankatwaterheaterrescue.com/forums/forum3/
Yes sediment can cause decreased amount of hot water when water cannot circulate around lower element, and sediment can cause lower element to burn out.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html
Following list is overview of tank troubleshoot:
If you have some hot water, then that says several things:
-Upper element is working.
-Electricity from circuit breaker to upper thermostat is good.
-ECO reset button is not tripped.
-You do not have overheating event.
-Access doors and insulation are in place and thermostat not exposed to cool temperature that causes overheating.
That leaves following suspects:
1) Check if TP valve is stuck open, or pipe cracked, or faucet leaking and running hot water down a drain.
2) Upper or lower thermostat is bad.
3) Lower element is bad -and- maybe tank has built-up sediment
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html
4) Loose wire. Open covers and inspect. Tighten screws very tight against copper wire.
5) Bad wire between upper and lower sections of tank.
6) Do complete 30 minute troubleshoot before replacing any parts.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
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