Table Pro Con And Tankless Water Heater Chart

User Manual: Pro-and-con-tankless-water-heater-chart

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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
Pressure sensor fails after 2 years
Tankless cannot be exposed more
than 11 grains hard water
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