The most common type of water heaters are storage tank water heaters and are typically either electric or gas-fueled. Most water heater sizes are around 40, 50, or 80 gallons. A 50-gallon water heater is fairly standard. But with a family of 5 or more and/or high water heating demands like a jacuzzi tub, going with a larger capacity will be best. Due to energy standards, electric water heaters larger than 55 gallons are required to meet a specific Energy Factor (EF) rating and will most likely need to be a heat pump water heater, fortunately, these are very efficient.
Gas fueled water heaters tend to have a much better First Hour Rating (FHR) and recovery rate to provide better performance. Where often a 50-gallon gas water heater will perform more closely to that of an 80-gallon electric and will satisfy the needs of most typical households.

Hard water is not necessarily bad for you to drink but it can have adverse effects on hair and skin. Otherwise, it is harmful to your home’s plumbing and any water-using appliances, resulting in a decrease in their efficiency and useful life.