Question about RTO Waste King AH-780-UL Quick&Hot Instant Hot Water Dispenser - Tank Only

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My AH-780 alternates between having great flow rate and just a trickle. Does anyone know the cause or fix?

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Hot water flow low, only in kitchen

could be a number of reasons.
The most sinister is rust build up in the pipes if pipe is galvanised iron.
The next cause could be calcium build up in the pipes. Solution put vinegar in the hot water service. If you can may not be able to
Next less sinister cause
A calcium buildup in the tap fitting - washer or cartridge that controls the water flow. Solution for this replace taps cartridge or washer .

Jan 24, 2016 | Water Heaters

1 Answer

Waste king 1001 disposer is jammed and won't rotate from inside with a broom handle. Do I need to take it apart to free it up?

Should be a place on the bottom of the unit to insert a hex or allen key to turn it to break it free... if its jammed. Make sure power is off/ disconnected prior to performing this task.

Aug 14, 2013 | RTO Waste King AH-780-UL Quick&Hot Instant...

1 Answer

5 year old Waste King AH-780-UL Quick&Hot Instant Hot Water Dispenser produces white residue in the dispensed hot water. What is causing this; what remedies are recommended? i took out faucet and the...

well the tank is made of brass and copper. That takes away that it is the unit. It sounds like lime buildup. Now what does happen as water goes into the tank and heats up lime will remain in the tank. Then as time goes buy it then starts to get to heavy and relesase itself and then the clog effect it taking place.

the best thing you can do now is reverse flow water into the tank and wash it out, its call beack washing. Yu can buy some products to put in at first to help break it down and then you get ore out.

With the new whole house units they now install a vakve set that has two way valves so you can backwash the tanks and stay ontop of the lime.

You must be asking where does the linme come from, well it starts at the well where the water department gets there water. then it goes into a filtering system and they use a lime to act as the filter agent then it heads out to the system and coats the pipes all along the way. I have cut 16 inch pipe and there was solid inch of lime caked inside.

I tell many people if yuo looking inside the water system yo would never drink the water. You might want to think about getting a whole house filter system to slow down the kime that geets in.

Thanks so much be safe in all that you do.


Hey, take a second and rate our service this way we know if we are doing a good job or tell how we can do better:)

Sep 11, 2011 | RTO Waste King AH-780-UL Quick&Hot Instant...

1 Answer

Water leaking from bottom of quick and hot dispenser only 18 mos old

I had the same problem. There is a 2 piece metal tank inside. The top and bottom of the tank are connected with screws & nuts, and there is a rubber o-ring between the two pieces. The grove for this o-ring is very shallow and it doesn't fit tightly, increasing the probability of misalignment during the assembly process. I was unable to fix the leak, IMHO the grove is too shallow and the o-ring is not thick enough. I decided it was poorly designed & trashed the unit.

Aug 26, 2011 | RTO Waste King AH-780-UL Quick&Hot Instant...

1 Answer

I have a well-x 250 the tank appears full of water. I cannot get any pressure in the top I tried pumping air in with an air compressor. right now I am draining the water out at just a trickle blowing air...

To get the water out so you can lift it knock a hole in the top next to the bend.then throw it in the garbage.250 is a big tank make sure you size the new one for your application.theres no fix $$$$

Mar 16, 2010 | Amtrol Water Heaters

1 Answer

Unit is plugged into a GFI outlet.Work for a while,but now,when reach the hottest point pop the outlet. I tried different outlet and it does the same

If it is popping the GFI reset on the outlet, there may be a leak inside it. GFI's usually only trip in the presence of water creating a path to ground. It could be just starting to leak and shutting off before enough comes out to see. You could try plugging it in to a normal outlet, but you must BE CAREFUL! If there is a leak, don't touch it or unplug it until you kill the power to it by tripping the breaker, pulling the fuse, or unplugging an extension cored at a safe distance. Obviously, if you have a leak, take the necessary steps to fix it.

Jan 11, 2010 | RTO Waste King AH-780-UL Quick&Hot Instant...

7 Answers

Water heater shuts off when the cold water is turned on

Not sure but check the inlet water at the heater, the filter may be clog up a little that restrict the flow. Did u use the heater at all during the winter? If not, the heat exchanger may be clogged with built up in there. U need to descale it. Good luck. Chinhcu

Mar 31, 2017 | Bosch Water Heaters

2 Answers

Water flow is reduced to a trickle after only 2 mos. of use with the quick&heat water heater. we are in San Diego and water is nit that hard. Lawrence

Lawrence; there are several potential points that can reduce your water flow. Try these items and let me know. Check hoses under sink for any kinks.......take the aerator off the faucet and run water if trickle is still there then aerator is fine......check the valve that the water comes from and make sure it is turned all the way on. If these do not solve your problem let me know. Thx

Aug 04, 2009 | RTO Waste King AH-780-UL Quick&Hot Instant...

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