How do I descale my on demand hot water heater?

Asked By: Lovely Fabia | Last Updated: 3rd February, 2020
Category: home and garden home appliances
3.9/5 (38 Views . 13 Votes)
Connect a drain hose to the hot water drain valve and place the end of the drain hose into the bucket. 7. Pour between three and four gallons of vinegar into the bucket so that the pump is completely submerged. Open both drain valve lever handles on the isolation valves and turn on the pump for at least an hour.

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Consequently, how do you clean an on demand hot water heater?

Open the purge port valves by twisting them perpendicularly to the position of the cold and hot valves. Use 2.5 gallons (9.46 liters) of undiluted white vinegar to clean your tankless water heater at all times instead of chemical solutions.

Likewise, how much vinegar do you need to flush a tankless water heater? Fill the 5-gallon bucket containing the submersible pump with 4-gallons of virgin, food grade, white vinegar. Do NOT dilute the vinegar. OPEN the Hot and Cold Service Ports. Turn ON the Submersible Pump and allow the vinegar to circulate thru the tankless water heater for at least 60 minutes.

In respect to this, how much does it cost to descale a tankless water heater?

Since rates vary wildly, I can't put an exact number on it, but expect to pay between $100 and $200 to service your tankless. This should include the descaling, cleaning of the filter and possibly replacing it, and doing any diagnostics of the tankless water heater system to make sure it is running properly.

What happens if you don't flush your tankless water heater?

Mineral deposits may build up. This could cause a clog within the unit and may prevent normal heating activity. Your hot water could also fluctuate and overheat the system, impacting its efficiency.

31 Related Question Answers Found

Can I use CLR to clean my tankless water heater?

If you do get an error message and must descale or flush your tankless water heater, kits are available online to do it yourself. “We recommend a 60-minute flush, using a white vinegar as the descaling material,” advises Fleming. CLR-type products can be harsh on the copper heat exchanger within the water heater.

Why am I not getting hot water from my tankless water heater?

Because tankless units only heat water as it's needed, running too many hot water appliances at the same time could mean the unit just can't keep up. On the other hand, your “no hot water” problem could be cause by a bigger issue such as: Plugged heat exchanger (due to hard water) A blocked vent/air intake.

What is the downside of a tankless water heater?

Tankless water heaters produce an endless supply of hot water, take up less space, have a lower risk of leaking, are safer, and have a significantly longer lifespan on average. The main disadvantage of tankless water heaters is their upfront cost (unit and installation) is significantly higher than tank-style heaters.

Do I need to flush my tankless water heater?

Tankless water heater manufacturers recommend their units be flushed at least once a year to eliminate the buildup of calcium and other minerals within the unit -- even more often if you have hard water. Some units will indicate when the unit is in need of flushing.

How do I put vinegar in my RV water heater?


How to Clean Water Heater Tank With Vinegar
  1. Add a vinegar water mixture to the RV's fresh water tank then pump it in.
  2. Remove the pressure relief valve at the top of the water heater and pour the vinegar mix using a funnel.
  3. Add it in using an RV winterizing kit (If you have one, definitely the easiest way)

Does tankless water heater increase home value?

A typical tankless water heater can cost anywhere between $500 and $2,000, depending on the model. Installation costs will also run you an additional $1,557 on average, according to Home Advisor. They found that homes with tankless water heaters sold for 4 percent more than their expected value.

How do you break the sediment out of a hot water heater?

How to Flush Sediment Out of a Water Heater
  1. Turn the Water Heater Off.
  2. Turn the Cold Water Valve Off.
  3. Let the water cool.
  4. Attach a drain or garden hose to the drain valve on the side of the tank.
  5. Place the end of the hose in a bucket or drain.
  6. Turn on a faucet (or two)
  7. Start draining the tank by turning on the drain valve.

How do I clean my hot water heater with vinegar?

Disconnect the cold-water inlet, hot water outlet, T & P valve, or element holes and, using a funnel, pour one (1) gallon of regular household cider vinegar into the water heater. (Do not dilute with water) ** NOTE: For Electric Heaters, it is recommended you remove the elements from the heater and lay them in a pan.

How does on demand water heater?

Tankless water heaters heat water directly without the use of a storage tank. When a hot water tap is turned on, cold water travels through a pipe into the unit. Either a gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water.

How often do you descale a tankless water heater?


A professional should descale your water heater at least once a year. BUT there are 2 specific instances in which you might need to get maintenance more than once a year…

Do you really save money with a tankless water heater?

Tankless water heaters save money in the long run, but initial costs are higher than tank models. The U.S. Department of Energy estimates gas-fired tankless heaters save an average of $108 in energy costs per year over their traditional tank counterparts, while electric tankless heaters save $44 per year.

What are the pros and cons of a tankless water heater?

Are Tankless Water Heaters Worth It? 10 Pros and Cons
  • Pro #1: Instant Hot Water.
  • Con #1: Inconsistent Temperatures.
  • Pro #2: Longer Lifespan.
  • Con #2: Higher Initial Cost.
  • Pro #3: Lower Month-to-Month Costs.
  • Con #3: Limited Hot Water Supply.
  • Pro #4: Space Savings.
  • Con #4: Additional Equipment is Often Necessary.

How do you get lime out of a hot water heater?

You can access the bottom of the heater through the drain.
  1. Turn off the heater.
  2. Open a hot water faucet somewhere in the house and leave it open.
  3. Flush the heater after it has completely drained by leaving the drain valve open while you open the cold water valve.
  4. Unscrew the drain valve with a wrench and remove it.

Do I need to drain my water heater?

You can see how much sediment ends up in and near the drain valve. Some hot water heater manufacturers recommend only draining off about a gallon of water, but suggest doing so once a month. Some people never drain their hot water heater tank. They may have sediment at the bottom of their tank.

Should you drain a water heater when not in use?


Importance of Draining Your Water Heater at Home
Some new heater owners ask me this question; “Should you drain a water heater when not in use?” My answer is always a “yes.” Despite these heaters' differences, it's crucial to drain the water because the sediment inside the tank can block the spigot.

How long does it take to descale a tankless water heater?

Open the isolation valves A and B. Turn on the circulation pump. Let the solution circulate through the tankless water heater for at least 30 minutes, but an hour is better. Drain the descaling solution from the heater and flush fresh water through the heater by closing valve “B”.

Can I flush my own water heater?

To flush your hot water tank, simply turn on the cold water spigot leading into your hot water tank. Let it run for a few minutes until the water exiting your hose runs clear. As you can see, I still had some sediment (can be seen at the bottom) coming out.