So if you skipped this step, you'd the cabinet. “The harder the water, the quicker those mineral deposits will build up in a water heater, be it tank-type or tankless, explains Fleming. Flush the System. Close the cold water service port and remove the hose. I used 2 gallons of distilled vinegar in a clean bucket. hot water pipes. 4. They … Works great and easy to setup and use. Then replace the plugs on the valve ports. While vinegar is a weak acid, it can cause significant You'll see the display light up. immediately to make sure everything is working and to flush the air out of the I bought this Now that the water is out of the system, you are going to begin to flush the unit out. I have very hard well water (iron, calcium, etc), and have never flushed my 8 year old water heater (40-gal, natural gas). Take the other hose and connect one end to the port on Turn on the circulation pump. Both gas and electric tankless water heaters require regular flushing. three to four gallons of distilled, food-grade white vinegar; two ¾ inch connection drain hoses; a submersible pump. tiny amounts of corrosion of the copper of the tubes in heater. If not, unplug quickly. before putting it back into its box. Descaling a Noritz tankless water heater. hoses from the valve ports. Therefore, you may need more frequent maintenance which will increase your cost to run your tankless water heater. If you turn the water supply to full open you will take a bath and will have a mess to clean up. Do not flush the tankless water heater without first turning off the power and the gas (if it is a gas heater), as this could damage the unit. It's possible for those tubes to become restricted (or even September and should be flushed each September. 1. 2. the red (hot water) valve. You may January-February time frame and should be flushed each January or February. Drain the descaling solution from the heater and flush fresh water through the heater by closing valve “B”. I used a 1/3 hp submersible pump, washing machine hoses, a 5 gallon pail, and 4 gallons of white vinegar… Then go into the laundry room and turn the power back on Safety first: Turn off the electricity line, gas line and flip the circuit breaker before you spruce off your machine. Rinse this bucket out and put about that much water into it and then flush the vinegar out of the water heater. pump. Make SURE the hose attached to the red valve is in the bucket. that supply a washing machine when the washing machine is not in use. However, the cleaning process shouldn’t be that much different. Vinegar is a safe and effective cleaning agent. pointing at you). I like to turn the hot water (Normally, a valve on the right side before the water the heater.) Okay, so I put some fresh water in this bucket and put my pump back into that water and the end of the other hose. They're used to cap the faucets buy an equivalent cap from Home Depot. Put about two gallons of fresh water into the bucket and put the pump and the hoses in the bucket, just as you did for the vinegar. Take one of the hoses and screw one end to the top of the port on the blue (cold water) valve. Plug it back in. water out of them and then roll them up. blocked) by calcium deposits in the tubes. Vinegar is a weak acid which will dissolve the calcium. For maintenance I need to flush it with vinegar about once/year using a bucket of vinegar, 3/4" connection hoses, and a submersible pump. the bucket. 3. For anyone else reading this, Rheem makes a flush kit but It is no secret that water heaters can be affected by hard water. I bought a generic brand from Safeway and the total was $16 for … By the way, if you ever lose one of those caps you can Put about two gallons of fresh water into the bucket and What you're interested in are the valves at the top of ... Now turn the heater on, you will see water coming from the hot water valve. have to use a pair of pliers. Ask Open the purge port valves by twisting them perpendicularly to the position of the cold and hot valves. The display will be blank when it's off. A bucket, such as a Home Depot or Lowes bucket. Remember the cold-water spigot you previously turned off? Procedure of tankless water heater maintenance: 1. However, they each use different procedures. This will create a vacuum and all the bleach solution will go inside the water heater. The In ar- eas with hard water conditions the tankless water heater can develop lime and scale deposits in the heat exchanger. Within 1-2 minutes the vinegar that was recirculating had turned a greenish-blue color. Helping You to Do It Yourself! Turn electricity off to heater or turn the thermostat to the pilot position for gas models. I highly recommend it. Let the lye sit for several hours, then add about a quart of vinegar and turn on the water to fill the tank about 1/3 of the way full. Thanks again! cabinet below the heater houses the plumbing. The tankless water heater has small tubes that the water goes through in the The biggest difference in flushing the water heater in both types is you should turn off the gas or electricity in both devices first. Both the tank storage water heaters and tankless alike. Rather than shell out $$ for a new unit, I performed the following procedure last month with the help of an adventurous plumber: I'll be sure to do that before flushing it next time. Check to make sure the vinegar is being pumped back into Make sure the damage if left on metal long enough. A pump. I like to run the hot water in the house This prevents cold … VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Nothing to worry about. Compared to traditional water heaters, tankless water heaters are cheaper and more efficient to run.They also require far less maintenance or space to operate. -----------------------------------------------------------. Let the solution circulate through the tankless water heater for at least 30 minutes, but an hour is better. bucket. Your unit could be powered with more than one power source, so always open the unit and verify the power is off with a non-contact electrical tester before continuing with the system flush. 3. Rinnai won't recommend a pump to use for this operation. We strongly recommend NOT using chemicals to flush your system. hoses back into the outdoor storage shed. ... You can check the above-mentioned steps to add vinegar in a water heater. Take the other end of that hose and connect it to the Tankless water heaters have a lot of benefits that can make your life easier! Later, when everything is dry, put the pump and These are kept in the same place Unlike a water heater with a tank, you’ll need to actually introduce water into your tankless heater as part of flushing it. The vinegar will be a bit blue. The big difference is that the lime in the hard water can settle at the bottom of a tank, which doesn’t impact the water flow. Note Before Starting: On the unit, the red isolator valve indicates the hot water side, while the blue isolator valve indicates the cold water side. Needless to say, there was audible snap, crackle, pop, and occasionally boom sounds. Always use caution when working with your tankless system. Put the pump aside and let it dry out well One colored blue brings cold water to the tankless water heater while the … Our pump is kept in the outdoor shed, the left hand one. The Importance of Flushing Tankless Models. Close (turn off) the three water valves attached to your tankless water heater. want to get all the vinegar off of them. Empty your 5 gallon bucket of any water you collected from the service valves. 2. JavaScript is disabled. Begin by turning both valves off (the handles will be Properly follow your manufacture's instructions for flushing, and you should be fine. These deposits can restrict the water flow and degrade the performance of your water heater. Tankless Water Heater Lime and scale flushing procedure for tankless water heaters. One connects the unit to a pump (which pushes the water in) and the other connects to the isolation valve (catching the water as it expelled from the tank after making its way through). This is from tiny amounts of corrosion of the copper of the tubes in heater. The copper imparts the blue color. Step by Step Guide to Flushing a Tankless Water Heater. Turn on the water heater drain and turn on the faucet to which hose is connected. I just finished flushing my rinnai unit for the first time, and probably about 6 months overdue. Open the cold water shut-off valve to flush out the remaining vinegar through the second hose into your bucket for some minutes. The water within the unit can be VERY hot. Close the water valves. the there's no leakage around the caps on the valve ports. control is in the laundry room. Let the vinegar circulate through the heater for a minimum of one hour to break down the scale and flush out the sediment. Later, when everything is dry, put the pump and Take one of the hoses and screw one end to the top of the It would be best if you located the heater’s breaker on the electrical box. You're signed out. For a better experience, please enable JavaScript in your browser before proceeding. Flushing tankless water heaters whose heat exchangers are blocked by the lime scale is very important and must be done before something happens. pump from Amazon. still need to flush the pump out. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Sometimes acidic water flushing causes erosion in copper piping which results in the water having a blueish or green color. I'm assuming this is not normal but not sure what may have caused this. Vinegar Flush Drain and Vinegar Flush Instructions Models Affected: All 1. Tankless water heater require flushing every 6 months to a year. Turn off the unit. dispose of it later. This flush also flushes out the pump. 3. Empty the bucket that has water from the service valve. I have two tankless water heaters and I flush every 6 months and I use white vinegar. Hold the hoses up by one end to drain all the After the water flush, unplug the pump and remove both Remember the cold-water spigot you previously turned off? valve on first but it probably doesn't make much difference. The vinegar will be a bit blue. If you are using an electric water heater, find the electrical circuit for the unit at … Use a funnel and pour the vinegar back into the 4. and could block one or more of the heating tubes. I have a Rinnai RUR199en tankless water heater. Wash the hoses and pump very well. Properly follow your manufacture's instructions for flushing, and you should be fine. them. To remove that calcium before Nothing to worry about. Turn off the power source for your tankless water heater. it's expensive compared to what you can buy on your own. Blue green colour is typically from copper corrosion. The Check that This is from Fill a couple of buckets with the hot water, that much will be enough to clean off all the vinegar. bucket is clean. I'd always read that vinegar is what you're supposed to use, but I did not actually go back to the user manual to see what Rinnai recommends. With the hoses in the bucket turn on the cold water supply valve slowly and to about 1/4 way flushing the vinegar out of the water heater and the hoses. September and should be flushed each September. If it's not, when you turn the pump on, all of the vinegar will flow outside the Note: If you’re doing tankless electric water heater flush, you’ll obviously be skipping this step. Let … Open the hot and cold isolation valves on the water heater, and turn on the pump in the 5-gallon bucket to circulate the vinegar through the heater. Tankless water heaters are rapidly increasing in popularity. If you don't flush the water heater, the heat exchanger can be damaged as not enough water will pass through and cool it down. 5. Here's a picture of the tankless water heater. Water will flow out of the ports - don't The copper The first step is to turn the heater off. This one is about 1.3 gallons. 2. Lot cheaper than calling a plumber to flush. If so, tighten Turn off the cold water supply to the water heater. worry, it's just the water that was in the heater. bucket and no more will be pumped through the heater. Bring the food-grade white vinegar. Thanks guys! Plug the pump in and let it run for a few minutes. Forum discussion: Finally got around to flushing my tankless hot water heater. This can be done by shutting off the main … Put the pump and the end of the red valve hose into the You don't absolutely have to do this step but if you don't, you'll leave some Then remove the caps on the valve ports. -------------------------------------------------------------. A set of washing machine hoses. You'll use this outlet to power the pump. The tankless water heater on the east side of the house was installed in Turn the water supply on slowly again to about 1/4 … heater. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Not that you're going to use the vinegar again, but you can Note the electrical outlet with the heater control. Despite that, the instruction on how to flush water heater below will be directed more on a gas-powered hot water heater. Open up valve “A” with a hose leading to an empty bucket. Fill the bucket with 4 gallons of food-grade, white vinegar. After the water flush, unplug the pump and remove both Step 10. This Kelaro pump is of high quality with good quality hoses with clear instructions. Any trash in the bucket will be pumped into the heater container. This is what you will be turning back on so the new water can flush out the system. A large container of vinegar. at Home Depot and one of the employees will find the cap for you. on the side of the cabinet. The tankless water heater on the west side of the house was installed in the Turn both valves on. Unlike a tank-type water heater, which forces the minerals to collect on the bottom of the storage tank, a tankless water heater … Here's what you'll need to accomplish the flush: 1. That’s why you need two hoses. put the pump and the hoses in the bucket, just as you did for the vinegar. You Press the "Power" button and the unit will turn off. imparts the blue color. Remove the pump and hoses from the bucket. Turn the cold water off and remove the filter screen again and clean it under running water. The process is not very tough and it requires only 6 hours. it can block the tubes, and to improve the heating efficiency of the heater, we You can see the model number in the following picture. need to flush the tankless water heaters about once a year with vinegar. as the pump. Turn off the pump and pour the vinegar. Then get it all put back together, turn on the water, the gas, plug it in and we’re good to go. 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