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Forum » How to drain a hot water tank?
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Thread: How to drain a hot water tank?

post 1616306711 09-12-2020, 08:59 AM
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How to drain a hot water tank?

One of my renters called and said there is no hot water and that there is water around the floor of the hot water tank. It's at least 30 years old, so I figure there is a pinhole leak from the tank rusting through. I shut off the water supply valve, unplugged the power and attached a garden hose to the drain valve and ran it out the door. Opened up the drain valve, but nothing drained out the hose. So I turned on the water supply valve and could get a trickle of water to come out the hose along with a bunch of white sediment.

When I turned off the water supply valve, the flow from the garden hose stops. I figure there must be several inches of sediment at the bottom of the hot water tank that is impeding the flow of water.

How do I drain the tank in order to remove it? It's a 50 gallon tank. The water alone weighs 400 pounds. Could I remove the inlet pipe at the top of the tank, insert some rigid vinyl tubing and siphon it out?
post 1616307361 09-12-2020, 09:09 AM
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If you have a compressor, I would try blowing some air into the drain outlet and see if that'll free up the obstruction.
post 1616310121 09-12-2020, 09:57 AM
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Open some faucets. Water isn't going to flow out of the hot water heater without you allowing air to flow in and "fill" that volume. Slightly open all of your faucets. They are going to need to be open later anyway.

Once drained, refill it, then drain it again. Refilling it stirs up sediment. Might as well get as much out as you can before to re-prime the whole system.

When done, refill it and go around to each faucet one by one. They'll sputter as the air comes out mixed with water, but when the flow is back to normal, shut it off and then go to the next one.

Alternately, you could hold the release valve open while you do all of this. I prefer doing faucets though.
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post 1616310391 09-12-2020, 10:01 AM
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post 1616310841 09-12-2020, 10:08 AM
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Originally Posted By 401Delta⏩
If you have a compressor, I would try blowing some air into the drain outlet and see if that'll free up the obstruction.
This.


Likely a pice of corroded crud stuck in it
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post 1616311041 09-12-2020, 10:11 AM
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post 1616311371 09-12-2020, 10:16 AM
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Drill it
post 1616311701 09-12-2020, 10:20 AM
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Originally Posted By Anachron⏩
I like my suggestion better.
But with which one? SBE I, SBE II, Super X3, 870, Stoeger Condor Supreme, Mossberg Silver Reserve, Beretta Silver Pigeon. Also have an Ithaca Mag 10.
post 1616311761 09-12-2020, 10:21 AM
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drink lots of hot water. hot chocolate is best
post 1616311831 09-12-2020, 10:22 AM
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Originally Posted By 401Delta⏩
If you have a compressor, I would try blowing some air into the drain outlet and see if that'll free up the obstruction.
This. Even one of those 12 car tire pumps. Might have to get pretty creative to join the hoses up but it would have the pressure.
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post 1616312221 09-12-2020, 10:29 AM
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Originally Posted By multiplemiggs⏩
This. Even one of those 12 car tire pumps. Might have to get pretty creative to join the hoses up but it would have the pressure.
It's what I'm going to do. Have a 5 gallon portable compressor and a bunch of different chucks with a trigger valve to attach them to. I'll put some sort of chuck into the garden hose and give it a blast of 150 psi air.
post 1616312391 09-12-2020, 10:33 AM
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Step by Step OP

1.) Be Hercules

2.) Carry b*tch out

3.) Don't complain about weight

Spoiler!
Drill a hole in the top and siphon with hose
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post 1616312451 09-12-2020, 10:34 AM
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