Can you put a tankless water heater after a tank water heater?

One solution that is often recommended by plumbers is the installation of an electric tankless water heater booster which can fit right onto your existing gas or electric tank-style water heater or be mounted nearby on a wall.

Can I preheat water before it goes through a tankless water heater?





The typical way to pre-warm water is to install a standard tank water heater before the tankless, but leave it turned off. Using an automotive radiator is a terrible idea. You don’t want to connect something not designed for potable water to your plumbing.

Do tankless water heaters heat water instantly?

Don’t All Tankless Water Heaters Provide Instant Hot Water? Yes, they do – and no they don’t. Tankless water heaters start heating water the moment you turn on the faucet, so it’s understandable why some people believe tankless water heaters provide hot water on demand.

What initiates a tankless hot water heater to begin heating water?

With a regular water heater, you expect hot water to travel from the tank through your pipes. However, with a tankless water heater, cold water actually flows through sensors that trigger the internal computer, and begin the heating process.

What is the downside of tankless water heaters?

The main disadvantage of tankless water heaters is their upfront cost (unit and installation) is significantly higher than tank-style heaters. Including installation, tankless water heaters cost 3 times more than tank-style water heaters on average.

Are electric tankless water heaters worth it?





Tankless: Gas and electric tankless water heaters run more efficiently than the conventional water heaters of the same fuel type. We rated the annual energy consumption cost Excellent for a gas model but only Fair for an electric, but both rate Very Good for energy efficiency.

How long does it take for water to heat in tankless water heater?

Instant Hot Water



Tankless units take about 15 seconds to bring water up to temperature, but you still have to wait for that hot water to arrive at your shower head or faucet, just as you do with a tank-type heater.

How do you preheat water?

Quote from the video:
Quote from Youtube video: We're actually injecting steam into the water. Below the surface to pick up those BTUs. And to bring the feed water temperature up if we look at this tank.

Does a tempering tank work?

Temper, temper



The tank will allow water to rise from the incoming temperature to the ambient basement temperature—often as much as a 30-degree rise—requiring much less energy to heat the water to 110 degrees in the heater.

Do gas tankless water heaters work when the power is out?



While on-demand gas water heaters don’t rely on electricity as a fuel source to heat water, on-demand heaters usually have a control panel that is powered by electricity which is the ‘brains’ of the water heater. So even a tankless gas water heater will not work independently in a power outage.

Which is better a tankless or with tank water heater?

According to Energy.gov, “For homes that use 41 gallons or less of hot water daily, demand (or tankless) water heaters can be 24% to 34% more energy efficient than conventional storage tank water heaters.” Tankless water heaters (if gas-fired) will save homeowners over $100 annually the longer they remain in service.

Can you run a tankless water heater on a 1/2 gas line?

Check the gas supply



A typical tankless water heater will need a ¾-inch gas line. However, if there is sufficient pressure and the run length is short enough, a ½-inch line may be sufficient with certain tankless water heaters, such as the Noritz EZ Series.

What are the main advantages of a tankless water heater over a tank heater?



Pros

  • Energy Efficient. The U.S. Department of Energy reports a tankless water heater is 24% to 34% more energy-efficient than storage tank water heaters—as long as you use around 41 gallons per day. …
  • Saves Money. …
  • Saves Space. …
  • Hot Water Supply. …
  • Limited Hot Water for Multiple Outlets. …
  • Power Outage. …
  • Costs More Upfront.


Do electric tankless water heaters need a vent?

No. Unlike gas tankless water heaters and gas traditional tank style water heaters, electric tankless water heaters do not require any venting. This is often one of the deciding factors when choosing whether you should purchase a gas or electric tankless water heater.

How big of a tankless water heater do I need for a family of 5?

In short, a family of 5 would need a 10 GPM gas tankless heater or 27 kW electric tankless heater if you live in the northern part of the USA, where the input water has a lower temperature. The tankless heater has to work extra hard to bring the water temperature up to 110˚F or 120˚F.

What size electric tankless hot water heater do I need?



Average Temp.



For example, if you are running 2 showers at the same time, you will need 5 gallons of hot water per minute from the tankless water heater. If you were running a shower and the washing machine at the same time, you would need 4.5 gallons per minute from the water heater.

Can a tankless water heater be installed in a closet?

Your tankless water heater can be installed just about anywhere! Due to the small size of your water heater, it can be mounted in many small spaces, including closets, under sinks, in pantries, or under stair storage areas.

How long can you shower with a 20 gallon water heater?

I generally take a 5-10 minute shower on a 20 gallon HWH which is fine for me. I don’t think changing the temperature will make a difference, yes it’ll increase temperature for those 30 gallons but after that it’ll drop temp until the temp can build up again. The low flow showerhead I think is your best bet.

How long does it take for a 20 gallon electric hot water heater to heat up?

Recovery Rating



It takes a little more than an hour for the electric 20-gallon hot water tank to completely replenish itself.

Is 40-gallon water heater enough for a family of 4?



Two and three-person families need at least a 40-gallon water heater. For a four-person family, a 50-gallon water heater is sufficient. 50-gallons is good if you’re using electricity, and 40 gallons will work for natural gas or propane.