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AGE of WATER HEATERS
AIRBOUND HEAT SYSTEM REPAIR by WATER FEED VALVE
ALTERNATIVE HOT WATER SOURCES
ANODES & DIP TUBES on WATER HEATERS
ANTIFREEZE for BOILERS
ANTI SCALD VALVES
APPLIANCE DIAGNOSIS & REPAIR
APPLIANCE EFFICIENCY RATINGS
AQUASTAT CONTROL Functions
BACKDRAFTING HEATING EQUIPMENT
BACKFLOW PREVENTER VALVE, HEATING SYS
BACKFLOW PREVENTER, HEATER WATER FEEDER
BACKUP HEAT for HEAT PUMPS
CARBON MONOXIDE - CO
CHECK VALVES, WATER SUPPLY
CHEMICAL CONTAMINANTS in WATER
CHIMNEY INSPECTION DIAGNOSIS REPAIR
CLOGGED DRAIN DIAGNOSIS & REPAIR
CLOGGED SUPPLY PIPING
CROSS CONNECTIONS, PLUMBING
DEBRIS in WATER SUPPLY, Water Heater
DRAIN a WATER HEATER TANK
ELECTRIC WATER HEATERS
FLOODED HEATING EQUIPMENT REPAIR
FLOODED WATER HEATER REPAIR
FREEZE-PROOF A BUILDING
FROST HEAVES, FOUNDATION, SLAB
GALVANIC SCALE & METAL CORROSION
GAS BURNER Flame & Noise Defects
GAS FIRED WATER HEATERS
GAS PIPING, VALVES, CONTROLS
HEAT TAPES, Heat, Insulation prevent Freeze-Up
HEATING COST FUEL & BTU Cost Table
HEATING COST SAVINGS METHODS
HOT WATER SUPPLY
HOT WATER IMPROVEMENTS
HOT WATER DELIVERY SPEED UP
HOT WATER EFFICIENCY IMPROVEMENT
HOT WATER PRESSURE EXPANSION RATE
HOT WATER PRESSURE LOSS
HOT WATER PROBLEM DIAGNOSIS
HOT WATER QUANTITY IMPROVEMENT
HYDROGEN SULFIDE GAS
INDIRECT FIRED WATER HEATERS
MANUALS & PARTS GUIDES - HVAC
MIXING / ANTI-SCALD VALVES
NO HEAT - NO HOT WATER: HEATER DIAGNOSIS
NOISE / SOUND DIAGNOSIS & CURE
NOISE CONTROL for HEATING SYSTEMS
NOISE, PLUMBING CHECKLIST
NOISE, WATER HEATER
ODORS GASES SMELLS, DIAGNOSIS & CURE
ODORS IN WATER
PIPING IN buildings, Clogs Leaks Types
PLASTIC Plexvent / Ultravent RECALL
PLUMBING FIXTURES, KITCHEN, BATH
PLUMBING VENT DEFECTS & NOISES
PUMPS, HEAT PUMPS
PUMPS, OIL BURNER
PUMPS, PONY PUMPS
PUMPS, SEPTIC PUMPS
PUMPS, SEWAGE EJECTOR / GRINDER PUMPS
PUMPS, SUMP PUMPS
PUMPS, WATER PUMPS
PUMPS, WATER REPAIR
RELIEF VALVE LEAKS
RELIEF VALVES - TP Valves on Boilers
RELIEF VALVES - STEAM TP VALVES
RELIEF VALVES - Water Heaters
RELIEF VALVES - Water Tanks
SAFETY, HEATING INSPECTION
SCALE REMOVAL, WATER HEATERS
SEWER GAS ODORS
SOLAR HOT WATER HEATERS
SOOT on OIL FIRED HEATING EQUIPMENT
SPILL SWITCHES - Flue Gas Detection
TANKLESS WATER HEATERS
THERMOSTATS, HEATING / COOLING
THERMOSTATS, WATER HEATER
TIMERS for ELECTRIC WATER HEATERS
WATER CONSERVATION MEASURES
WATER CONTAMINANT LEVELS
WATER HAMMER NOISE DIAGNOSE & CURE
WATER HEATER ALTERNATIVES
WATER HEATER ANODES, DIP TUBES
WATER HEATER AIR INLET
WATER HEATER DEBRIS FLUSH
WATER HEATER DRAIN PROCEDURE
WATER HEATER EFFICIENCY
WATER HEATER FLUSH PROCEDURE
WATER HEATER NOISES
WATER HEATER PROBLEM DIAGNOSIS
WATER HEATER COMPARISONS, PROPERTIES
WATER HEATER SCALE - De-Liming Procedure
WATER HEATER SCALE PREVENTION
WATER HEATER SAFETY
WATER HEATERS for HOME HEATING USE?
WATER ODORS, CAUSE CURE
WATER PIPES, Clogs Leaks Types
WATER PRESSURE & FLOW MEASUREMENT
WATER PRESSURE GAUGE ACCURACY
WATER PRESSURE LOSS DIAGNOSIS & REPAIR
WATER PRESSURE REDUCER / REGULATOR
WATER PRESSURE PUMP REPAIR GUIDE
WATER PUMPS, TANKS, TESTS, WELLS, REPAIRS
WATER PUMP REPAIR GUIDE
WATER QUALITY TESTS, CONTAMINANTS, TREATMENT
WATER QUANTITY IMPROVEMENT
WATER SOFTENERS & CONDITIONERS
WINTERIZE A BUILDING
What is the life expectancy of a tankless water heater, & what are the types & applications of tankless water heaters - demand water heaters or instantaneous water heaters.
This article describes typical and special applications of tankless or instantaneous water heaters in a variety of uses, and we distinguish among single or point of use demand water heaters, whole-building water heaters, when or how to use a gang of multiple instant water heaters, & the location of tankless water heaters outdoors vs. indoors.
Tankless or demand water heaters are also referred to as point-of-use water heaters when installed close to the fixtures or bath or kitchen where used.
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Thermostatic Hot Water Booster Applications
A single point of use tankless water heater is installed where a boost in hot water temperature is needed such as
Sketch of a point of use tankless water heater shown above was provided courtesy of Carson Dunlop Associates.
Our photo (left) illustrates a Cinsa Hidro Tec instant water heater (calentador) for sale in a Home Depot in Celaya, Mexico.
Tankless water heaters are made in models designed to be installed outdoors, exposed to weather, or indoors in a protected area such as a basement or utility room or near a point of use.
According to the U.S. DOE,
Note that this analysis does not include the cost of maintenance and repair for tankless water heaters that may experience extra costs especially in areas of water that is aggressive, corrosive, or high in mineral content.
Watch out: we are doubtful of this DOE claim. In fact tankless water heaters may be particularly vulnerable to installation errors, site conditions, weather exposure, or variations in gas or water pressure to the appliance. And in areas served by water high in mineral content the water heater's life may be short without proper maintenance. [Note that some tankless water heaters such as some more costly Bosch models, are designed to withstand hard water.]
The warranty period for the Bosch 13BP low-pressure LP gas instant water heater described at TANKLESS WATER HEATER INSTALLATION is 24 months from the date of first connection. [4a]
Causes of Loss of Warranty Coverage on Instant / Tankless / Point-of-Use water heaters
For just about any product, a close look at the terms and conditions of the product warranty also give us clues about the product's particular vulnerabilities or limitations. So it's always worth actually reading the warranty, including that for a tankless water heater.
Watch out: the Bosch warranty described above is voided if the water heater was not installed by an authorized service technician. The company provides telephone numbers of their authorized installer or service agency right on the packaging. Nevertheless, especially as heaters may be installed at buildings remote from larger cities where Bosch maintains a service staff, it is more likely that many installations will be installed by a local plumber or even a handyman - in essence meaning that the unit has no warranty whatsoever. [4a]
Other causes of loss of water heater warranty coverage include:
Watch out: to assure that your instantaneous water heater continues to perform satisfactorily be sure to perform the maintenance recommended by the manufacturer. Particularly in areas where water is high in mineral content, de-scaling the water heater will be required at intervals determined by the amount of use the appliance receives.
Continue reading at TANKLESS WATER HEATER REPAIR GUIDE or select a topic from the More Reading links shown below.
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