Yes, that is easily done, but will it cope adequately with demand ?
Yes you can.
36000
One can find instructions for a 40 gallon water heater for installation from the 'American Water Heater' website where it can be viewed in PDF format. One can also find instructions on the 'About' website.
It is not the square feet that determines the size water heater you need it is the demand. The more people who live in the home the higher the demand on the water heater to produce enough hot water. 1-3 people requires a 40 gallon water heater 4-6 people requires a 50 gallon water heater Of course you can make do with a 40 gallon water heater with a family of 4 or more but you will at times run out of hot water. Even if there are only 1 or 2 living in the home do not buy a 30 gallon water heater. You save very little money and may run out of hot water. But at least a 40 gallon.
Installing a tankless water heater instead of a traditional 40-gallon water heater offers benefits such as energy efficiency, cost savings on utility bills, longer lifespan, and a continuous supply of hot water.
30, 40, or 50 gallon depending on how big your water heater is.
To calculate the BTUs needed to raise the temperature of a 40-gallon water heater by 60 degrees Fahrenheit, you can use the formula: BTUs = gallons × temperature rise × 8.34. For a 40-gallon heater, it would be 40 gallons × 60°F × 8.34 BTU/gallon°F, resulting in approximately 20,016 BTUs. Therefore, it takes about 20,016 BTUs to achieve that temperature increase.
Usually about 2 hours of labour.
Upgrading from a 40-gallon water heater to a tankless system offers benefits such as energy efficiency, cost savings on utility bills, endless hot water supply, longer lifespan, and saving space due to its compact size.
Usually 30 amp
A 40-gallon gas water heater typically takes about 30 to 40 minutes to heat water from a cold start to the desired temperature. However, the exact time can vary based on factors like the initial water temperature, the heater's BTU rating, and the efficiency of the unit. Some models may heat water faster, while others may take longer.
An average household is 4 people . They require a 40 US gallon heater. Add 10 gal for each additional person.