Often asked: How To Clean A Tankless Water Heater?

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

Tankless water heaters won’t explode, but if you don’t flush out the sediment, you may force the unit’s heat exchanger to work harder than necessary. Keeping sediment flushed out not only helps the water heater work more efficiently, but it can also prevent other problems.

Do tankless water heaters need to be flushed?

The primary maintenance requirement for tankless water heaters is a system flush. This involves pumping a vinegar solution through the unit to break down scale buildup.

How much vinegar do I need to clean a tankless water heater?

To descale a tankless water heater, you will need:

  1. a five-gallon bucket;
  2. three to four gallons of distilled, food-grade white vinegar;
  3. two ¾ inch connection drain hoses;
  4. a submersible pump.
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What is the average life of a tankless water heater?

Most tankless water heaters have a life expectancy of more than 20 years. They also have easily replaceable parts that extend their life by many more years. In contrast, storage water heaters last 10–15 years. Tankless water heaters can avoid the standby heat losses associated with storage water heaters.

Can I use CLR to flush my tankless water heater?

CLR can be used with distilled vinegar to clean a tankless water heater. Adding one capful of CLR into each gallon of white vinegar can help remove tough deposits inside your water heater.

How often should I flush my Rinnai tankless water heater?

Just like a tank unit, tankless water heaters need to be flushed once per year. Homeowners with hard water should consider flushing and cleaning the unit even more frequently, perhaps every six to nine months because of the excess amounts of magnesium and calcium found in hard water supplies.

Why does my tankless hot water heater go cold?

Another problem that tankless water heaters can run into is that of a cold water sandwich—a plumbing term given to sudden temperature fluctuations, when your tankless water heater produces hot and cold water intermittently. This can be caused by: A dirty water filter on the cold water inlet.

Will vinegar damage a hot water heater?

Vinegar is acidic, so it attacks steel. The water and acid causes rust and rust causes holes that leak. The best way to protect a water heater is to prevent hard water scale build up in it, and the only way to do that is with a water softener.

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What is the downside of a tankless water heater?

The primary disadvantage of on demand or instant hot water heaters is the upfront cost. The smaller units that you often see won’t produce enough hot water to serve most households. They’ll only serve one faucet at a time—a problem if you want to shower while the dishwasher is running.

Can you run out of hot water with a tankless water heater?

With a tankless system, there isn’t a supply of hot water that can be depleted. Instead, the water heater heats up water as there is a demand for it. It will keep doing this as long as there is demand – and that means you won’t run out of hot water!

How long do you run the pump to clean a tankless water heater?

Turn ON the Submersible Pump and allow the vinegar to circulate thru the tankless water heater for at least 60 minutes. This process will break down and flush out the lime scale build-up. The pump should operate at a rate of 4-gallons per minute, if your pump circulates at a slower rate, allow the pump to run longer.

Can I use vinegar to flush my tankless water heater?

Tankless water heaters will build up calcium and debris on the elements and the filters inside the machine. It’s important to perform a flush with food-grade, white vinegar at least once every 12 to 18 months. Performing this simple maintenance will improve the efficiency and life of your water heater.

Why does it take so long to get hot water from my tankless water heater?

The length of the delay can be determined by a few factors, including the distance between the water heater and the outlet. In other words, the longer the water has to travel, the more cold water will need to be discharged before the hot water appears.

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Can you use vinegar to clean a water heater?

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. Then, pour vinegar over them to allow it take the sediment off the elements.

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