Now it my understanding that dual water heaters are supposed to be plumbed in parallel. By putting a water heater in between the cold supply and the other hot water heater, you can warm the cold water first so that the final water heater need only heat up already-warm water.

Similarly, What is the most cost effective hot water heater?

The Most Efficient Water Heater Available—The Rheem® Hybrid Electric Water Heater—the smartest, quietest and most efficient water heater on earth, paying for itself with up to an estimated $4,750 in energy cost savings over 10 years.

Also, Are large water heaters more efficient? All other things being equal, the smaller the water heater tank, the higher the efficiency rating. Compared to small tanks, large tanks have a greater surface area, which increases heat loss from the tank and decreases the energy efficiency somewhat, as mentioned above.

26 Related Questions and Answers Found 💬


What size tankless water heater do I need for a family of 5?

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.

How many water heaters do I need for my home?

But if you only need a loose estimate of what size you need (versus an exact calculation), follow these guidelines: For 1 to 2 people: 30-40 gallons. For 2 to 3 people: 40-50 gallons. For 3 to 4 people: 50-60 gallons.

Which is better hot water heater or tankless?

According to, “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 a tankless water heater fill a tub?

A small tankless water heater can take a long time to fill a large tub. Third, if for some reason a larger water heater cannot fit, and the properly sized tankless is too expensive, you can add a second standard water heater next to your present tank. Two smaller water heaters can do the job of one big water heater.

How does a water heater tank booster work?

Tank boosters work by mixing cold water from the input valve with the heated water that comes out of the hot water valve. With a tank booster, the water heater temperature can be set to 140 F but will come out at 120 F, meaning less hot water is coming out of the tank and increases storage capacity.

What is the best brand of tankless hot water heater?

Best Tankless Gas Water Heater Reviews – (Top-Picks)
  1. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater.
  2. Rheem RTGH-95DVLN Indoor Direct Vent Tankless Natural Gas Water Heater.
  3. Rinnai RUC98iP Ultra Series Propane Tankless Water Heater.
  4. Eccotemp i12-NG Tankless Water Heater.

Do all houses have hot water tanks?

A vast majority of homes have conventional tank-type water heaters, which are powered by either gas or electricity. When hot water is called for at a faucet or appliance, heated water is pumped out the top of the tank and through the home’s hotwater supply pipes.

Plumbers typically charge $45-$65 per hour and can typically install a water heater in a day (6-8 labor hours), for a total labor cost of $270-$520.

How do you level a water heater?

How to Level a Hot Water Heater With Shims
  1. Place a carpenter’s level on the side as well as on the top of the water heater to determine which side of the water heater needs to come up.
  2. Tilt the water heater up just enough to place a shim under the leg on the side of the water heater that needs to come up.
  3. Set the water heater back down carefully.
  4. Tip.

Do I need more than one tankless water heater?

For larger households that typically use more than 85 gallons per day, two tankless systems, or the largest available model, are likely needed. For smaller households that use under 40 gallons per day, one unit should suffice.

How do you hook up a propane tank to a hot water heater?

You can connect a propane tank of nearly any size to your household hot water heater as long as you satisfy three conditions: You need to install a pressure regulator between the tank and hot water heater, ensure that the hot water heater is equipped for propane rather than natural gas, and maintain the correct safe

Can you use a tankless water heater with a tank water heater?

Takagi Tankless Water Heaters can be used as an indirect water heater in conjunction with a storage tank for high volume situations. For those of you using multi-shower heads – this is an excellent and efficient way to use multi-shower heads and still get the efficiency of a tankless water heater.

How do you connect two water tanks?

How long do tankless water heaters last?

20 years

Do tankless water heaters run out of hot water?

Since tankless heaters heat water as it flows, you’ll never run out of hot water. Tankless heaters also last five to ten years longer than a storage tank model. Electric models don’t produce greenhouse gases, and there’s no possibility of flooding due to a ruptured tank. There are also drawbacks to tankless heaters.

How do you plumb two water tanks together?

To link tanks together so that they both evenly fill is accomplished by linking the tanks together near the bottom at their sides with piping. As your first tank fills up and water reaches the height of your link, rainwater will flow into your second tank until it attains the same height.

How do you connect two hot water heaters parallel or series?

Series is where the cold water goes into one water heater then through the second water heater. Parallel is where the cold supply has a tee which feeds each water heater independently and joins them back together to one hot water supply.

Can you put 2 tankless water heaters in series?

Tankless electric water heaters can be installed in series.

Two Titan N-120 water heaters create very hot water, even at high flow rates during the winter.

Can I add a second water heater?

Adding a Second Water Heater. One of the first things done by the average homeowner who is running out of hot water is to turn up the thermostat on the storage tank. But depending on the extent of the re-routed distribution lines, installation of a separate stand-alone water heater can cost at least $900.

Your expansion tank can be anywhere on your plumbing system and does not need to be installed in close proximity to the water heater. It is most commonly installed using a “T” at the cold inlet to the water heater. But, functionally, it can be installed anywhere on the cold inlet line.

Do hot water tank boosters work?

Water heater boosters will improve your hot water pressure while increasing the temperature. This means more risk of scalding and accidents. They use less energy than water heaters, but they only work when attached to a water heater.

What is a water heater tank booster?

The Tank Booster is a cost effective solution for increasing usable hot water capacity on an existing tank or a new high efficiency water heater. Adding a Tank Booster mixing valve to a water heater allows water to be stored at a higher temperature, but safely delivered at 120°F (49°C) to all outlets.

Are larger water heaters more efficient?

Water heaters larger than 55 gallons will see a much bigger jump in efficiency. The new standards for these larger water heaters can be met using electric heat pump and gas condensing technology. Heat pump water heaters save at least 50% and condensing gas units about 25% compared to today’s conventional water heaters.

What size hot water tank do I need for my house?