The Harman P68 stove is quite a sophisticated pellet stove with traditional styling. The P68 can maintain a constant temperature, and features an exhaust probe to increase efficiency and reduce fuel consumption. The hopper can hold up to 76 lbs of pellets, and there is an optional hopper extension to 136lbs.
Stove Heat Output:
Up to 68,000 BTU’s
Heating capacity up to 2,200 sq.ft
Stove Biomass Pellet Choice:
The Harman P68 like the other Harman stoves I’ve covered on the blog uses Harman’s patented feeder and burn pot. This gives the stove a better chance of working with a wide variety of biomass pellets. Harman state in the specification for the stove that the fuel is ‘Bio-Mass Pellets’ and ‘The Harman P68 Pellet Stove will burn any grade of pellet at maximum efficiency’. I think with the above statement they are referring to any grade of wood pellet, but the Harman stoves in the Cornell trials have preformed well on grass pellets.
Instead of using a thermostat the P68 uses a sensing probe to send information to the stoves microprocessor. This information is used to determine the pellet feed rate to maintain a constant temperature. This enables the stove to maintain a constant temperature, and could help when burning different biomass pellets, as feed rates do need to be changed. Many pellet stoves and boilers use a thermostat to start and stop pellet feeding. Therefore the temperature of the stove may have an average of say 70 degrees, but the temperature will vary between 65-75 degrees. Finally the P68 has an exhaust temperature sensor, this greatly increases efficiency because it stops excessive heat being wasted up the chimney. Our Tatano boiler also has an exhaust temperature sensor.
Maintenance and Efficiency Features:
Large Ash Pan
Patented Pellet Pro Feeder
Patented Pellet Pro Burn Pot
ESP Control (Exhaust Sensor)
Accordion Heat Exchanger
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