Why does my tankless water heater go cold during shower?

If you have an older tankless water heater (10+ years old), the problem is most likely that the minimum flow rate is too high. So to avoid damage to the heat exchanger (and to avoid scalding you with super hot water), your tankless unit will shut itself off, leaving you with cold water in the middle of your shower.

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.

How many showers can you have in a tankless water heater?

With the same heater and the same energy expenditure, you will be able to run 2 or 3 showers simultaneously. Especially with the bigger units, it’s worth noting the running costs as well. You can check how much electricity do bigger electric tankless water heaters use here.

Can tankless water heaters keep up with demand?

Although tankless water heaters technically cannot run out of hot water since they are designed to always heat up more water on demand, they can be overwhelmed with demand when there are multiple taps or appliances on at once.

What happens if you don’t descale tankless water heater?

Why You Should Flush In standard tank models, failing to descale can pose a risk of explosion. 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.

What temperature should my tankless water heater be set at?

You’ll want to shoot for 100-115 degrees Fahrenheit for your water to be heated. If your groundwater temperature is 60 degrees and you want your shower at 110 degrees, that’s going to be a 50-degree rise.

Why is my tankless water heater not getting hot?

Ensure there is no condensation or debris on the burners that may cause them to not ignite. If the flow is too low, the burner will not ignite. Low pressure is one of the most frequent tankless water heater problems and is easy to fix.

Do tankless water heaters get hot water faster?

It is an understandably common myth. Although tankless water heaters do provide hot water on demand by detecting when you turn on the faucet and instantly heating incoming water, they cannot make that water move any faster through the piping.

Can you take a shower with a tankless water heater?

After all, when you’re ready for a shower, you don’t want to stand there waiting. While a tankless hot water heater can supply one shower with endless hot water, the capacity is usually limited to just one faucet. Do a load of laundry while you’re taking a shower and a tankless heater will have a hard time producing enough hot water to supply both.

Why does my tankless shower shower turn off by itself?

You see, if not enough cold water is flowing over the heat exchanger, it runs the risk of overheating. So to avoid damage to the heat exchanger (and to avoid scalding you with super hot water), your tankless unit will shut itself off, leaving you with cold water in the middle of your shower.

Why does my shower get hot when I turn it on?

That’s not uncommon, as these appliances will pull available water from your system and thus change the amount of either cold water or hot water running to your shower. For example, when a toilet flushes, it will pull cold water to fill up the tank. This can often cause a shower to become suddenly hot.

Can a tankless water heater run too many appliances?

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.