The first hour rating is the number of gallons of hot water the heater can supply per hour (starting with a tank full of hot water).
What is a good first hour rating for a water heater?
38 to 42 gallons
For the majority of homes, peak hot water use is in the morning when people are showering. This number is used to determine the best first-hour rating. So if your peak hour demand is 40 gallons, the best match for a water heater would have a first-hour rating of 38 to 42 gallons.
What does first hour delivery on a water heater mean?
First Hour Delivery (or sometimes called first hour rating) is a term that describes the performance capability of the water heater. By definition, first hour delivery is the calculated amount of hot water a fully heated water heater can deliver in the first hour period.
What is the first hour rating of a 50 gallon water heater?
The first hour rating on 50 gallon water heaters range from 60 gallons with an electric water heater to 95 on a high end gas water heater.
What is a good efficiency rating for a water heater?
Look for the thermal efficiency rating rather than EF, with values of 0.90 and above. The minimum efficiency of electric resistance storage water heaters is about 0.90 (depending on tank volume), and the best available are 0.95 EF.
What size water heater do I need for a family of 5?
If your family size is 5 or more, you’ll need an 80-gallon tank (electric) or a 50-gallon tank (natural gas or liquid propane).
Is higher Btu better for water heater?
The higher the BTU input and efficiency, the faster the recovery. Electric water heaters typically have one 5,500-watt or two 4,500-watt elements. Two lower-kilowatt elements will heat much faster than one higher-wattage element.
How is First hour Rating calculated?
To determine the first hour rating, you multiply the tank capacity by 70% and add the recovery ratehow quickly lost hot water in the tank is recovered. The tank capacity is multiplied by 70% to account for the loss of heat caused by cold water entering the tank.
What does GPH recovery at 90 degrees F gallons mean?
Recovery is measured in gallons-per-hour (GPH) supplied, at an increase in water temperature of 90 ? degrees Fahrenheit.That does not, however, mean that they need a water heater with 100 gallons of storage.
How is water heater recovery rate calculated?
The recovery rate is the amount of hot water the water heater is capable of producing in a given period of time.Take this & divide by 8.33 (pounds per gallon of water) & then divide by the temperature rise required.
Is there a big difference between a 40 gallon and 50 gallon water heater?
The Energy Factor
The cycling losses measure how much heat is lost as the water circulates through the system.With the energy factors being equal, the difference in cost of running a 50-gallon heater over a 40-gallon heater is essentially insignificant.
What size hot water tank do I need for a family of 4?
Water Heater Sizes
For example, a family of 3 to 4 people should purchase a 50 60 gallon water heater. On the other hand, a household with 5 7 people may require a water heater with a 60 80 gallon water tank.
What size water heater do I need for a family of 6?
A family of 6 or more needs a 60-80 gallon water heater.
These numbers are only estimates and vary greatly based on how much hot water you use within your busiest hour. The Peak Hour Demand calculation is the amount of hot water your home is likely to use within a busy one-hour period.
Is a tall or short water heater better?
Short Water Heaters Are Energy Efficient
In comparison to tall water heaters, the short ones are almost 40% more energy efficient. Opting for appliances with higher energy efficiency ratings is always a wise choice. Low energy consumption will result in low energy costs and help you save some money.
Which is better 40 or 50 gallon water heater?
Typically, the rule-of-thumb is that you want a 40 gallon tank for 1 to 4 people, a 50 gallon tank for 4 to 6 people, and a 50 gallon high recovery or 75 gallon tank for 6 to 8 people. Energy consumption for 40 and 50 gallon standard water heaters is quite comparable.
Are new gas water heaters more efficient than old ones?
A. New water heaters are more energy efficient than old ones, but there is no need to replace an old one which is not leaking.When the tank starts to run out of hot water, for example after many long showers, the top element comes on instead to supply hot water faster.
How many showers can you have in a 40 gallon tank?
A 40-gallon water heater can provide up to 2 showers in an hour (if you’re not using any other water appliances).
Is a 20 gallon hot water heater big enough?
20-gallon water heaters are a unique size. They’re large enough for smaller homes that don’t require large amounts of hot water, yet they’re an excellent choice for high-demand point-of-use (POU) applications such as bathrooms with showers. The versatility of the 20-gallon size makes these heaters ideal for many uses.
What is the lifespan of a water heater?
8 to 12 years
The type of water heater and where you are located: While many say 8 to 12 years is the expected life for a standard gas-powered water heater, this range can change and be very dependent on where you are located. The level of sediment in your tank affects the lifespan of your water heater.
How many BTUs do I need?
Size and Ceiling Height
| Area To Be Cooled (square feet) | Capacity Needed (BTUs per hour) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
How many BTUs do I need for a 40 gallon water heater?
34,000 BTUs
A common input is 34,000 BTUs on a 40-gallon tank and 36,000 BTUs on a 50-gallon tank. The higher the BTU input and efficiency, the faster the recovery.
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