There are three categories of Kenmore gas water heaters that we will review here; Power Miser, Power Vent and HydroSense. All these Kenmore models come with a variety of capacities, powered by propane and natural gas and available for purchase at Sears.
Kenmore gas powered water heaters are designed for potable residential
heating, while higher capacities including 74 and 98 gallons are for
commercial use. They cannot be used in manufactured or mobile homes and
All residential water heaters are designed with tank
capacities of 30, 40 and 50 gallons, enough for small and
middle sizes homes and
for families of 4 to 6 family members.
Power Miser series is Kenmore's the most popular line with the widest selection of water heaters. There are also sub categories including Power Miser 6, 9, and 12 and tank sizes 30, 40 and 50 gallons, with a warranty of 6, 9 and 12 years.
All Power Miser models are equipped with the PEX Roto-Swirl dip tube, a self-cleaning system for sediment build up. To guard the metal tank from aggressive water condition, these gas units are protected with a glass lined coating and one or two anode rods.
Models with two anode rods, because of better protection against corrosion they provide, are coming with the warranty of 12 years. Models with the 9-year warranty have larger anode rods than the models with 6-year warranty.
Temperature and pressure relief valve is factory installed, so you don't have to worry about choosing the right TPR valve that meets the requirements and proper installation (per codes).
Kenmore 50 Gal. Tall Natural Gas Hot Water Heater (33157) - rated 4 stars, this standard size heater offers 12-year warranty, with the two anodes for tank protection, Self-cleaning PEX Roto-Swirl cold water inlet tube and 2" energy efficient foam insulation.
Kenmore 40 Gal. Tall Natural Gas Hot Water Heater (33147) is also rated 4 stars as the above unit,has the same specs, but smaller tank.
Kenmore 50 Gal. Tall Natural Gas Hot Water Heater (33205) - rated 3.8, this unit is Power Vented model with the hot surface ignition and electronic temperature adjustment.
Kenmore Power Miser 6, 30 gal. models are designed as short and tall units, using natural and propane gas. Foam thickness on all 30 gallon models is 1" with the insulation R value 8. Recovery rate at 90 degree rise for natural gas models is 36.3 gph, gas input is 35,500 BTU/hr and first hour rating 67 gallons.
Propane models have the recovery rate of 32.7 gph and gas input of 32,000 BTU per hour.
Kenmore Power Miser 6, 40 gal. models can be found in two sizes, short and tall. Foam thickness on all 40 gallon models is 1" with the insulation R value 8. Recovery rate at 90 degree rise for natural gas models is 36.3 gph, gas input is 35,500 BTU/hr and first hour rating 68 gallons.
These 40 gal. size water heaters are also qualified as EnergyStar models. Foam thickness on these models is 2" with the insulation R value 16. Recovery rate at 90 degree rise for natural gas models is 40.9 gph, gas input is 40,000 BTU/hr and first hour rating 70 gallons.
Kenmore gas water heaters that are with the Ultra Low Nox combustion and Energy Star qualified, have 40,000 BTU/hr gas input, 67 gallons for the first hour rating and 41 gph recovery rate at 90 F rise.
Propane model is having recovery rate of 36.3 gph, first hour rating 68 gallons and gas input of 35,500 BTU per hour.
Foam thickness on all 50 gallon models is 1" with the insulation R value 8. Recovery rate at 90 degree rise for natural gas models is 36.3 gph, gas input is 35,500 BTU/hr and first hour rating 83 gallons.
Kenmore Power Miser 6, 50 gal., EnergyStar models, come with the foam thickness of 2" with the insulation R value 16. Recovery rate at 90 degree rise for natural gas models is 40.9 gph, gas input is 40,000 BTU/hr and first hour rating 88 gallons.
Propane models have the recovery rate of 36.3 gph, first hour rating 83 gallons and gas input of 35,500 BTU per hour.
When you buy Kenmore gas water heaters from Power Miser 6 series, Sears provides you with 6-year warranty that covers tank leaks or defected product and materials, as long as the product is installed properly and per codes. In addition, Kenmore gas water heaters parts are also covered for 6 years and 1-year labor.
Power Miser 9 gas water heater can be found in two sizes; short and tall, with the tank sizes of 30, 40 and 50 gallons, and some are EnergyStar qualified.
For Power Miser 9, Sears provides 9-year warranty for the water heater tank and 9 years for the parts.
Recovery rate is in a range from 36.3 to 51.2 gallons per hour at 90 F rise, first hour rating is up to 90 gallons for 50-gallon high-recovery tank model and max gas input is 50,000 BTU/hr.
As they provide 9 years of the warranty, the anode rod is larger in size than the one used for Kenmore gas water heaters with 6-year warranty.
Two models with a tank size of 40 and 50 gallons, from Power Miser 12 series are available, with a limited warranty of 12 years for a water heater tank and 12 for replacements parts. Both models are EnergyStar qualified.
With two large anode rods installed against the corrosion, they allow Kenmore and Sears to provide such a long warranty; tank is even more protected against aggressive water action.
Both models are design for 40,000 BTU/hr gas input and with a recovery rate of 40.9 and first hour 70 and 88 gallons.
Kenmore gas water heaters from Power Miser series are designed to use a single pipe system, atmospherically vented with a minimum vent pipe of 2, 3 or 4" in diameter. This venting system is used to remove the products of gas combustion outside. Correct installation and per codes is a must for the safe, proper and efficient work of the water heater.
Another way is to connect the venting system, vertical type B, to the lined masonry chimney with a proper draft.
At the same time for the unobstructed water heater operation, sufficient air must be supplied for combustion, ventilation and dilution of flue gases. By providing two permanent openings the fresh air will be drawn inside the room where the unit is installed, either directly from outside or from inside the building.
For the proper piping installation, one of the requirements is that the water supply pressure should not exceed 80 psi. If the pressure is above, than the pressure reducing valve should be used.
Recommendation is to insulate water pipelines in order to reduce energy loss and even freezing if the water heater is subjected to lower temperatures.
For closed water systems install an expansion tank in the cold water line as the heated water tends to expand its volume, and to prevent an excessive increase in the water pressure, frequent discharge on TPR valve or even tank leakage.
Temperature and pressure relief valve is provided with the water heater and the properly sized discharge pipe should be installed.
Kenmore gas water heaters are heating potable water only and recommendation is to use copper, CPVC or polybutylene piping only.
Power Miser Kenmore gas water heaters are using a White-Rodgers gas control valve with the pilot light to light the main burner and thermocouple as the safety element. By using the gas control valve you will be able to light the pilot flame, main burner, set and control the water temperature. The pilot light is ignited by an electric spark generated by pressing the igniter button.
Another safety element is a high temperature limit switch, called ECO or Energy Cut Off switch that reacts if the hot water temperature exceeds 195 F, shutting off the unit.
Power Miser models are using the FVIR system to reduce the risk of flammable vapor related fires, so all the vapors will be burn inside the combustion chamber, not outside. This is done with a help of specially designed water heater element called flame-arrestor. The FVIR system will shut off the system in a case of the incident.
If you decide to buy one of Kenmore Power Miser 6 models the price range is between $350 for the 30-gallon tank models to maximum $620 for Power Miser 6, 40 gal. Ultra Low Nox and Energy Star model.
Kenmore Power Miser 9 price range is from $380 for 30 gallon up to $700 for Kenmore Power Miser 9, 40 Gallon, Ultra Low Nox and Energy Star model.
Kenmore Power Miser 12 price is around $520 for 40 gallon and $590 for 50 gallon tank size water heater.
Power vent models are designed as EnergyStar appliances in two sizes, 40 and 50-gallon. For lighting the main burner they are not using a pilot light as Power Miser models, but hot surface ignition system.
Products of combustion are forced out by power vent and through the PVC pipe installed through the roof or outside wall.
Its main advantage is the intelligent diagnostic system used for troubleshooting and easier repairs and the electronic temperature control on 50 gallon model.
Max gas input they can get is 40,000 BTU/hr, with a first hour rating of 69 and 83 gallon per hour. They come with a 6 plus 6 limited warranty.
Power vent models are sold for $720 and $800 bucks.
HydroSense series is constructed as 40 and 50 tank size water heater and EnergyStar qualified. First hour ratings are 67 and 90 gallons, max BTU is 40,000. It is equipped with the electronic control module a great and intelligent tool for error diagnostics and handy for troubleshooting.
Thanks to the 2 anode rods installed, warranty is 12 years for the tank and 3 years on replacement parts.
Prices for these two HydroSense water heaters are $530 and $600.