For traditional tank water heaters, yes, it is generally better to leave them on all the time. The energy required to maintain the water's temperature is actually less than the energy needed to reheat an entire tank of cold water from scratch.
Only heat the hot water twice a day
Try heating the water for an hour in the morning and an hour in the evening. Start the water heating about an hour before you need it. For example, if you shower at 08:30, start heating the water at 07:30. If you wash up in the evening at 19:30, then start the water heating at 18:30.
To effectively control Legionella bacteria, the CDC recommends storing hot water at 𝟏𝟒𝟎∘𝐅 (𝟔𝟎∘𝐂) and maintaining circulating hot water above 𝟏𝟐𝟎∘𝐅 (𝟒𝟗∘𝐂).
A 40-gallon water heater typically provides about 8 to 15 minutes of uninterrupted, hot shower time. While the tank holds 40 gallons, the actual hot water lasts longer because it is mixed with cold water, allowing for 4-5 average-length showers back-to-back if they are short (5-7 minutes).
Extended use can gradually lead to a significant rise in electricity usage, contributing to high electricity bill causes. Over time, the constant operation can cause wear and tear on the heating element and other components.
Potential Risks of Leaving It On
Leaving your water heater on during a winter vacation can pose several risks, including leaks and unnecessary energy consumption. Water heaters, especially older models, can develop leaks over time, which may go unnoticed if you're away. This can lead to water damage and costly repairs.
If a standard showerhead is fitted, it will use around an extra half a gallon each minute, accounting for a 25-gallon emittance every 10 minutes, or 50 gallons throughout a 20-minute shower. *1 gallon = 4.54 litres.
To use exactly 10 gallons of water, your shower time depends entirely on your showerhead's flow rate, which can be calculated with the formula Time=10Flow Rate.
It is very common to find a 50 gallon water heater in a 3 bedroom/3 bathroom home. This is not only because the uniform plumbing code regulates the minimum capacity required in homes based on bedroom and bathroom size, but also because a 50 gallon capacity unit will appropriately serve a to 3 bed/3 bath residence.
The longest-lasting water heater brands are Bradford White and Rheem (specifically the Marathon series). Bradford White is favored by plumbers for professional installations and longevity, while the Rheem Marathon uses a unique fiberglass tank backed by a true lifetime warranty.
The first signs of Legionnaires’ disease typically appear 2 to 14 days after exposure to Legionella bacteria. Early symptoms are often flu-like and include:
Domestic water heaters, particularly electric devices, can certainly be contaminated by Legionella. In Quebec, a study of 211 homes (178 electric water heaters, 33 oil or gas water heaters) found Legionella contamination in 40% of electric water heaters.
Run your shower for 5 to 10 minutes to flush out stagnant water. If the property has been vacant for several weeks, some experts recommend running it for up to 20 minutes.
A 10-minute shower typically uses 12 to 25 gallons (45 to 95 liters) of hot water. The exact amount depends on your showerhead's flow rate and the temperature you prefer (as hot water is mixed with cold):
In winter, you should set your water heater between 120°F and 130°F (49°C to 54°C). This range strikes the perfect balance between keeping your hot water warm enough to offset the cold incoming groundwater and keeping your energy bills and scalding risks in check.
If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it. You might need to turn on your heating earlier if your home takes longer to reach a comfortable temperature.
We recommend going with Rheem, specifically for the Professional Series with 8 Year Warranty.
This problem usually comes down to capacity, heat production, or mixing issues inside your plumbing system. Sometimes the fix is simple, like adjusting your water heater temperature or flushing out sediment. Other times you may need a new mixing valve, an element replacement, or a different size water heater.
There isn't a single "number 1" model, as the ideal water heater depends on your home's setup, but top-rated brands dominating the market include Rheem (best overall tank/tankless) and A.O. Smith (best for durability and commercial-grade units).
A 10-minute shower typically uses 50 gallons of water if you are using an older, inefficient showerhead (rated around 5 Gallons Per Minute - GPM). With a standard modern showerhead (2.5 GPM), it would take a 20-minute shower to reach 50 gallons.
For a 3-bedroom house, the ideal water heater size depends on how many people live there and your choice between a tank or tankless system.
The 4-minute shower rule is a sustainability and cost-saving initiative advising people to limit their daily showers to four minutes or less. This practice helps conserve water, reduce energy used for heating, and lower household utility bills by limiting consumption to approximately 36–40 liters (roughly 9.6–10.5 gallons) per shower.
Some common causes of high water bills include:
A 20-minute shower almost always uses more water than a bath.