|Specifications||Tankless Water Heater||Conventional Water Heater|
|Max BTU.||194,000 BTU||Ave. 75,000 BTU|
|Size||1.6 Cubit Feet||Ave. 24 Cubit Feet|
|Dimensions||23.6″(H) X 13.8″(W) X 9.4″(D)||64″(H) X 26.5″(W)|
|Weight||46 lbs.||325 lbs.|
|Standby Heat Loss||0% – No insulation required||20%|
|Vent||4″ Diameter w/ Power Fan||Draft Hood|
|Computer Modulated Gas Valves||Yes||No|
|Computerized Safety Devices||Flame Rod, Thermal Fuse, Lighting|
Protection Device, Electric Leak Prevention
Device, Overheat Prevention Device,
Freezing Prevention Device, Fan Rotation Detector
|Electronic Flow Sensor||Yes||No|
|Minimum Flow Rate||0.75 GPM||None|
|Size of Exhaust Pipe||Inside: 4″ Round|
Outside: Vent Cap
|Powered Combustion||Yes (Fan Assisted)||No (Gravity)|
|Gas Connection||3/4″ NPT||1/2″ or 3/4″ NPT|
|Water Connection||3/4″ NPT||3/4″ NPT|
|Warranty||10yr. Heat Exchanger / 3 yr. Parts||1 yr. Parts / 5yr. Tank|
|Life Expectancy||10-15 Years||3-8 Years|
|Energy Cost||Saves up to 50% – Unit can pay for itself|
|Cost up to 50% More|
|Floor Space Saving||Wall mounted or outdoor installation saves|
$100 per square foot of floor space.
|Wastes $100 per square foot
of floor space.
|Ease of Installation||Small size allows for installation close to|
point of use, eliminating need for
recirculation systems for long runs of piping
|Big and Heavy. Requires mechanical closet
and/or barrier post and stand. May
need recirculation system and
additional structural requirments.
|Total Installation Cost||Total cost of installation roughly the|
same. Less components and bulk
|Cost roughly the same.|
|Service Ability||All parts are replaceable – Full unit|
replacement not necessary.
|If tank leaks, entire unit must be
|Tank Leakage||Tank cannot leak – NO TANK||Tank leakage can cause expensive
property damage and safety concerns.
|Scaling||No storage prevents most cases of|
scaling. Scale can be easily cleaned and
flushed out of the unit.
|When scale develops, unit must be
|Hot Water Capacity||Unlimited and Instantaneous.||Tank is cold when 70% of capacity
has been used. Full recovery time
can be 2 to 3 hours.
|Control of Water Tempature||Digital remote controller sets water|
|Either preset from manufacturer
or with imprecise knob.