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Things you can do to increase amount of hot water
#1 Thing to do to increase amount of hot water:

Adjust water heater thermostat to higher temperature. How to adjust thermostat

Adjust water heater temperature higher in winter when incoming water is colder.
Average bath temperatures are 104-106 and rarely higher.
120 F is temperature for optimal savings, 140F is for killing bacteria  
Temperatures above 135 are extremely dangerous and will scald (burn) the skin in seconds. 120 will scald in 60 seconds.

Install mixing valve to protect from very hot water when thermost is set high. How to save hot water using mixing valve
Under counter water heaterInstall small under counter water heater and connect to cold water so it draws no hot from tank
Point of use water heaters

Use dual handle faucet:  When hot is turned on, even a moment, cold water immediately enters water heater, reducing the first hour delivery of tank.
Single handled faucet lifted in center will draw hot water from tank. Applies to gas and electric heaters. Dual handle faucets at Amazon

Use a pot heater at sink. A small pot heater keeps water warm or hot to make tea or wash hands.  Buy pot heater
General things to do to increase amount of hot water: How to increase amount of water:

Maintain water heater How to maintain water heater
Clean sediment out of tank Clean sediment out of tank
Install two tanks. Two water heaters
Install tempering tank to passively preheat incoming cold water in winter. Tempering tank
Install under-counter water heater at sinks. How to install under-counter water heater
Install insta-hot faucet in kitchen. Use pot boiler at kitchen sink. See examples

Install larger water heater tank. How to install gas water heater
Gas water heaters heat more quickly than electric See chart
Install water heater with higher recovery rating, and higher first-hour delivery. Calculate first hour
Electric water heater can be rewired to increase recovery time so tank heats faster and delivers more hot before running out. Calculate and change recovery on electric water heater

Install larger wattage element if water heater and wiring support conversion Replace element  See chart
Fix all single-handle faucet cartridges. Bad cartridge can add cold water to hot. Check for crossover
Fix drips and leaks. Can run hot water out of tank.

Install recirculation system Recirculation system puts hot water at faucet so there is less waiting.

Turn off hot water to washing machine.
Install dishwasher on cold water line instead of hot. Wash dishes by hand.

Leave gallon jugs of water in sun during day for hot water needed at lunch or dinner.
Install solar water heater in addition to other sources. Solar water heater

Change water use schedule.
Install shower timer so more people can shower before hot runs out.
Install low flow shower heads and aerators so hot lasts longer.
Don't use the oversized bathtub
Take showers instead of bath. Shower uses 5-9 gallons hot water, bath uses 12-15 gallons See details
Take showers in quick succession so hot water located at top of tank does not cool when incoming cold water arrives.
Do not turn on hot water when using cold water so more hot is available. Single handled faucet lifted straight up will cause cold water to immediately enter tank  Read about:. Dip tube  &  Crossover

Electric: convert elements from non-simultaneous to simultaneous operation. requires additional circuit breaker and wire to heater, and rewire of heater. Simultaneous wiring
Gas water heater: install external air intake so ambient room temperature is not lowered in winter when combustion draws cold air through cracks and doors.

Reduce water pressure in house using pressure reducing valve. Turn down water well pressure. Hot water lasts longer. Plumbing pipes and fixtures last longer.
Clean restrictions in pipes. Low hot water pressure
Shorten distance from hot water tank to usage point. Distance hot water travels in 30 seconds

Clean sediment out of tank to increase efficiency. How to remove sediment/ efficiency numbers
Insulate water pipes throughout house. Insulate water heater   Read 9-ways to save with water heater
hatco booster heater Buy Hatco:
Hatco booster heaters at Amazon

What is this thing?
180-190 degree hot water

Generally used for commercial applications such as washing dishes.

Use for sanitizing or commercial process
Gas and electric models available
Single-phase and 3-phase models

How to wire Hatco booster heater
Temperature needed to kill bacteria
water flow rate Hot water slow to arrive at faucet?
1) Use timer and 1 gallon container to see how many gallons of water come out of faucet in 30 seconds.
2) Measure distance from water heater to faucet.
3) Open hot water faucet. Use timer and see how long it takes hot water to arrive at faucet
4) Measure water pipe diameter. Most pipes from water heater are mixed 3/4" & 1/2"
5) Use chart above to see if hot water is slow to arrive at faucet.
Low hot water pressure
Broken dip tube
Low water pressure
Low hot water pressure
water consumption bathtub Regular bath uses 13- 15 gallons of hot water (20 gal water total)
Set water heater timer for 45-60 minutes for hot bath
water consumption shower Shower uses 6 - 8 gallons of hot water (10 gal water total)
Set water heater timer for 20-30 minutes for hot shower

Family chart for setting water heater timer,
based on incoming water temperature
hot water consumption Water heater holds 30 / 40 / 50 / 60 / 80 gallons of hot water depending on size of tank. A fully heated 40 gallon tank gives you 2 baths and a shower at one time.
Old sizing chart
Post 2015 heaters require high tech for sizes over 50 gallon
Take showers instead of bath. Save 10 gallons hot water each time.
To achieve same hot water consumption as previous heater withut buying more expensive heater install 2 water heaters, cut consumption, maintain heater, turn up thermostat temperature

Two water heaters
9 ways to save with water heater
Maintain water heater
How to adjust themostat
Ways to increase hot water
Calculate first hour delivery
airplane Troubleshoot electric water heater
Troubleshoot gas water heater
Additional links

How to install gas water heater

Leaking water heater

9 ways to save with water heater

How to wire off-peak water heater

Clean sediment from tank

Anode rods

Low hot water pressure
water heater safety precautions
Water heater safety precautions

Replace circuit breaker

See basic 120V and 240V water heater circuits

How to wire Cooper 277

Remove water heater from attic
Support the economy:
Buy water heaters from my associate links:

50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

How to install gas water heater
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Troubleshoot Gas valves with manuals
Icon gas valve

How to replace water heater element Waste King disposal
How to wire tankless electric

Install point of use water heater
Titan tankless

Contactors/ relays
Install and troubleshoot garbage disposal Waste King disposal
Programmable timers

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Type 1 and type 2 surge protection surge protection
Industrial electric

Industrial supplies

Tools and home improvement

Home and garden

Hayward pool
Pentair pool

Southwire electric

Black and Decker

Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades
box timers Resource:
Compare box timers
DPDT timers
Control water heater w/ Z-wave
Intermatic control centers Resource:
Intermatic control centers: and parts
Digital control centers and parts
Tork control centers and parts
All control centers and parts
programmable timer Resource:
Programmable timers
Countdown timers
Off delay timers
On delay timers
Timer modules
Din rail
Twin & one-shot
Low voltage power packs Recirculation systems
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