SearchAsk us anythingarrow rightHow many showers can you put in a 40 gallon water heater?If you're not using any other water appliances, a 40-gallon water heaters can provide up to 2 showers in an hour.Let's Get It Fixed!Our virtual experts can diagnose your issue (for free!) and resolve simple problems.Chat with a live expertChat nowCall 1 (855) 466-3948Call nowRATESHARECopy linkTwitterFacebookmagnifying glassLink copied to clipboard.SUBMIT AN ANSWERShop Recommended ProductsShop HomeX Recommended ProductsRELATED QUESTIONSHow tall is a 40 gallon hot water tank?Smith® 40-Gallon Tall Natural Gas Water Heater is 18 in.How long is a 20 gallon shower in gallons?It's fine for me to take a shower on a 20 gallon HWH.How many amps does a 40 gallon hot water heater use?A 20amp circuit or a 20amp breaker should only feed a max of 16amp load, because a 16amp heater should be wired and protected by a 20amp circuit. Depending on the code, a 2500w heater w/240v will draw 2500/240 or 18.75 Amps and either 25 or 30 Amps.What temp should I set my water heater?If you haven't adjusted the temperature on your hot water heater, it's probably set to 140 degrees, which is the default setting from most manufacturers.How many baseboard heaters can you have on a circuit?A circuit running on a 20-amp double-pole breaker can have any combination of heaters up to 3,840 watt. You can install two 1,500 watt heaters if you use just one thermostat. There are three 1,000 watt heaters.How many thermostats are on a water heater?There are two thermostats and two heating elements in most residential hot water heaters. The lower element does the work in low water usage conditions.