How to clean sediment out of water heater ... and replace elementTime required: 1 afternoon <> job is easier with a helper > Start early so you have time for 2 trips to hardware storeRead steps so you have tools ready |
![]() | How
electric water heater works How to troubleshoot electric water heater How to troubleshoot gas water heater How to test elements Low water pressure Flooded water heater How to wire water heater thermostats How to replace thermostat How to remove rusted element Water heater will not drain Maintain water heater |
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✔ Gradually
less hot water <> this page shows how to fix
problem ✔ Suddenly less hot water because bottom element burned out <> this page shows how to replace ✔ Suddenly no hot water/ other problem? How to troubleshoot electric water heater. ✔ Water around bottom of tank/ leaking water heater ✔ How to clean sediment out of gas water heater Efficiency of electric heater is fully restored using steps below Sediment caused by heating hard water. Minerals include calcium carbonate and dolmite Hard water generally not harmful. |
![]() -Buy new element at hardware store.
-Use same wattage. -Wattage of element printed on end of each element. -Use 30 amp breaker and 10 gauge wire for wattage greater than 3800 W -You do not need special element. -Clean elements with white vinegar |
| Step by step
Do-it-yourself starts here caution sign used
to emphasize step and keep you awake |
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| Step 1: |
Look ahead <>: Step 8 uses tester to check if electricity is off |
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Step 2:
Test if water
can drain from heater Don't turn off water
<> full water pressure is neededConnect garden hose to water heater. Rotate tank drain counter-clockwise to open. See if water comes out end of hose. |
Step 3: Clogged? What
to
do if
water heater will not drain
Connect washing
machine
hose to water heater
drain-valve <> Connect garden hose between outdoor
spigot and
washing machine hose <> turn on outdoor
spigot for a few
seconds so water pressure flushes tank open
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Water is draining | |||||
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Step 4:
To drain tank
completely ... Open hot water side of bathtub faucet so
air can enter pipe.
Leave tub valve open so
at end of job you know when
tank is full of water before
electricity is turned back on. |
Step 5:
Turn off water
going into water heater. Do this by shutting off water valve just above
water heater -or- close main shut-off valve to house
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My head Contact/About |
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| Step 6: While tank is
draining <> Remove bottom cover on water
heater
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Step 7:
Locate
element <> it sits below thermostat
<> has 2
screws with 2 different colored wires <> and is
1-1/2" diameter
If you are uncomfortable putting hands close to electricity when using tester, tape tester prong to wooden tongue depressor or chopstick |
Step 8:
Test if 120V or 240V electricity is off.
Use ordinary tester 1. Test black wire to ground screw 2. Test black wire to white wire 3. Test white wire to ground screw >> if no light shows with these 3 tests, then electricity is off |
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Step 9:
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Step 10: Take wires off element Move wires out of way |
Close-up
of element How to test element |
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Element wrench or socket Lightweight 1-1/2" element wrench available hardware store, home center, plumbing supply ![]() Or use 1-1/2 socket/ Some elements are 1-7/8" |
Step 11:
Turn element wrench
counter-clockwise
Here's
the trick <> loosen
element before tank is empty of water so weight of water
will hold tank while you
push on and twist wrench <> be careful: don't remove
element until tank is empty or water will flood out hole |
Step 12:
Take out old element Here's what to do if element won't come loose: Before going further,
check inside tank for loose pipe coming from top
<> broken
dip tube causes reduced hot water and
wasted electricity > also good time to check
anode
rod
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Step 13:
Rent shop-vac <> and buy pipe
Garden hose bends into tank
3/4" PVC is nice fit with garden hose
1" clear tube fits 3/4" PVC
30" piece of 1/2" CPVC reaches back of
tank
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Step 14: Tape hoses together with duct tape. Clear package tape also works. The clear tube is handy. Length of 1" clear tube lets you see if sediment is flowing past. Sediment is a slurry of water and calcium carbonate that clogs the pipe easily <> so it's handy when you can see when the stuff is flowing past. |
Step 15:
vacuum out tank Short piece of garden hose bends into tank. Use 1/2" cpvc to break up debris
Protect carpet from rusty water |
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| Step 16:
Buy new element Check Watt
rating printed on side of
tank.
Tank wattage is element wattage. Watts also printed on element. How to test element for continuity to see if element is good. New element is less worry. |
Step 17:
O-ring O-ring is heat-resistant seal
Must have O-ring to seal tank from leaking water |
Element ready for
installation
Also see damaged
red wire has been cut back and ready to attach to new element
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| Step 18:
Enlarged wire repair Overheating was caused by sediment built-up that reached element and caused a short |
Step 19:Clean around element opening so O-ring will seal Do not use teflon tape or pipe joint compound on element threads |
Step 20: Tighten new element using element wrench. Don't overtighten, a firm snug is enough |
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Wait
to turn on breaker |
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Wires go on either
screw.
Tighten screws very tight against copper wire |
Step
21: Close drain <> put cover on <> turn on water
Do not
turn on circuit breaker until tank is full of water |
Water heater elements are made specifically to be immersed in water or they will burn out instantly |
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water side of bathtub is turned on but no water is coming out After water heater fills with water, water will start to come out bathtub valve |
✔ Bathtub hot water side is running with no air gaps <> turn off tub <> momentarily open TP valve on water heater to bleed last of water <> turn on circuit breaker | Step 22: Turn on breaker <> put ear against water heater <> bubbly fizzing sound says it's working <> wait 10 minutes to see if water is getting hot <> job is done |
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| Technical information |
| Water
heater efficiency: Electric water heaters operate at 99% efficiency Gas water heaters operate at 69% efficiency Tankless gas heaters operate at 80% efficiency High-efficiency tank-type gas heaters at 96% efficiency 'Efficiency' is not same as 'energy saving' . All costs are energy: Consider total cost of water heater: Cost of unit, cost of installation, projected repairs, whether repairs are do-it-yourself, if parts are generic and available locally, true life expectancy of unit, monthly energy bill over life of unit, and disposal-replacement cost > read more Other factor will weigh eventually including direct carbon emissions released at each home from gas appliances. All costs are energy: If there was a breakthrough water heater that suddenly lowered people's bills, and reduced overall energy consumption, people would be waving their monthly bill in the air and everybody would know. There is no news. Choose lowest overall cost water heater to save energy. Research pdf: water-softener/water-heater efficiency comparison Read do-it-yourself: 9 ways to save with a water heater |
Effect of hard-water WITH water-softener Efficiency of gas and electric water heaters is unchanged over time when hard water is softened, however softened water corrodes anode rod and will reduce life of water heater unless anode rod inspected and replaced every 2 years. Once anode rod is 50-75% corroded, water heater tank begins to rust. This condition leads to leaking water heater which cannot be repaired. Rusted water heaters can rupture and cause massive damage as water runs until problem is discovered. Read more & See Anode rod options |
Effect of hard-water with NO water-softener: > Efficiency of gas heater drops 6-8% after two years > cleaning tank of sediment build-up will not restore full efficiency > however, regular flushing to prevent sediment maintains efficiency > Tankless gas heater will fail when pressure sensor clogs with sediment within 2-3 years depending on hardness of water > regular de-liming will not restore efficiency > softener and filter are required > Efficiency of electric heater stays at 99% until sediment reaches bottom element > cleaning tank and replacing lower element restores full efficiency > regular flushing to prevent sediment build-up also maintains efficiency Research pdf: water-softener/water-heater efficiency comparison |
Water-softener reduces life of anode rod in gas and electric water heaters Water heater manual says: "Artificially softened water is exceedingly corrosive because the process substitutes sodium ions for magnesium and calcium ions. The use of water softener may decrease life of water heater tank." Six-year tanks come with 1 anode rod. Read manual. Generally, tanks with longer warranties come with 2 anode rods. Anode rod options |
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