2011                                                Pro and con tankless water heater                                 http://waterheatertimer.org/pro-n-con.html           
Type of heater Saves energy Unlimited  hot water?  Easy to convert  Water pressure  Particulate in water Life Expectancy Can be integrated
with solar, geothermal, heat-pump or other energy source
 Temperature adjustment
Whole house tankless electric

No savings

Can cost more.

 Hard for electricity to heat water as water rushes past in pipe. See image
-Yes- When unit not undersized with optimal conditions

-Not consistant with saving energy or water

- No hot water in power outage
No, 
- Requires 90-120 Amps

- Typical home electric service is 150-200 Amps (check main breaker to see amps of  your service)
- Upgrade service panel to convert to tankless electric.

-Homeowner install not recommended
1/2-3/4 gal per minute water flow before heater turns on

Low pressure causes tankless to shut off elements
High tech sensors will clog and fail in 2 years without softener
Read .pdf

Succeptable to lime build-up.
De-lime each year
Claims of longer life not backed by warranty.

No warranty without plumber trained by specific manufacturer.

Require surge protector
No
-Cannot store heat from other source

Cannot heat and store water during off peak

-Always demand
fossil fuel
-Temperature adjustment with dip switches.
Read Page 4

Adjusting temperature can shut down elements if water cannot heat fast enough.
Whole house tankless gas
Saves $1-$8  per month
See hidden costs
-Yes- When unit not undersized with optimal conditions

-Not consistant with saving energy or water

- No hot water in power outage
No,
Requires 1-1/4" gas pipe
Requires air intake pipe
Requires stainless-steel flue
Requires 110V electric line 
Requires professional installation
Located farther from faucets

-Homeowner install not recommended
1/2-3/4 gal per minute water flow before heater turns on

Low pressure causes tankless to shut off burner
High tech sensors will clog and fail in 2 years without softener
Read .pdf

Succeptable to lime build-up.
De-lime each year

Claims of longer life not backed by warranty.

No warranty without plumber trained by specific manufacturer.

Not proteced by FVIR

Require surge protector
No
-Cannot store heat from other source

-Always demand
fossil fuel
-Temperature adjustment with dip switches.
Read Page 4

Adjusting temperature can shut down burner if air, fuel and vent don't match.
Regular electric water heater

  
You can save 4-9% operating cost by insulating tank
See how
Can heat and store water during off-peak

-Heats 21 Gal per hour
See chart

- Stored hot water available any time.
Regular electric water heater can be installed by homeowner Hot water available with any flow or pressure

Allows water conservation
Regular flushing maintains tank
See how

'Self-cleaning' tanks available

Corrosion-fighting anode rod inside each unit
6-12+ years
-No extended warranty without professional installation.

-Homeowner can diagnose and repair same day using locally-available interchangable parts
Yes

-With minor pipe changes, storage water heaters store heat gathered from other sources
See options
-Simple to adjust temperature. Read
Regular gas water heater
You can save 3-5% operating cost by lowering thermostat 10º
See how
-Heats 41 Gal per hour
See chart

- Stored hot water available any time
Regular gas water heater can be installed by homeowner
How to install gas water heater
Hot water available with any flow or pressure

Allows water conservation
Regular flushing and clean burner maintains tank
See how

'Self-cleaning' tanks available

Corrosion-fighting anode rod inside each unit
6-12+ years
No extended warranty without professional installation.

Homeowner can usually diagnose and repair using locally available parts

Protected by FVIR
Yes

-With minor pipe changes, storage water heaters store heat gathered from other sources
See options
-Simple to adjust temperature. Read

clogged sensor
Pressure sensor fails after 2 years

Tankless cannot be exposed more than 11 grains hard water









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