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Pro and con for tankless water heater |
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Spend $1000+ to save $1-8 a month Maintenance heavy Expensive parts Expensive repairs |
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| 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 How to wire tankless electric |
-Yes- When unit not undersized with optimal conditions -Not consistent 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 Susceptible to lime build-up. De-lime each year |
Claims of longer life not backed by
warranty. Possibly no warranty without service technician 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 consistent 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 Susceptible 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 protected 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 interchangeable 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 10ºF See how |
-Heats 40-60 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 |
> Tankless problems are difficult to diagnose> Tankless cannot be repaired by homeowner > Delays waiting for tankless manufacturer means homeowner has no hot water  |
|
 Tankless cannot be exposed more than 11 grains hard water |
Tankless are not
made in your town and cannot
be repaired by homeowner Why spend a $1000 to save $1 - $8 a month? Read Bradford White side-by-side test results Read 9+ ways to save more with regular storage-type heater |
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How to install tank-type gas water heater |
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Troubleshoot Rheem Tankless water heater Troubleshoot Bosch Tankless water heater Hidden cost of tankless |
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Bobby Dollar says: Check it out ... before you buy Before buying a tankless: 1 Ask questions: tankless require maintenance and are expensive to operate 2. Read warranty instead of promo literature 3. Look at parts sheet and ask how expensive future problems will be 4. Tankless heaters require softener & filter: sediment and lime will clog parts 5. Check water pressure > low pressure will cause tankless to stop heating 6. Check community conservation plans > tankless heaters require high water flow 7. The promise of unlimited hot water is not consistent with energy savings 8. Add up BTUs of your gas appliances to see if gas meter is large enough 9. Are there service manuals and maintenance steps available? 10. Is there a qualified service technician for your brand nearby? Read very long list of things to know before buying tankless |
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How to wire Tankless electric water heater |
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All tankless have
circuit board Gas and electric require surge protection How to wire whole-house surge protector |
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Recirculation systems |
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