Your solder should always be placed on the opposite side of the pipe where the flame is directed.…
An Uponor plumbing system features Engel-method crosslinked polyethylene (PEX) tubing. This is a flexible plastic tubing product that has been used for more than 35 years in radiant floor heating, plumbing and fire safety systems.
Uponor Controls and Poly pipe cladding on boiler copper lines
A certified appliance refers to a designation affixed to the appliance by means of a a label. This label is provided by the company that has "certified" the appliance in terms of function and clearance to combustible materials.
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Pellets, like conventional wood, differ in variety and some wood species perform better than others. It has been our experience that burning premium grade pellets, like fir, provide for more heat, less ash and less sooting due to moisture content. Though they tend to be more expensive they will most likely save you money in the long run as you will require less fuel and maintenance
Pellet stoves are essentially forced air space heaters and require electricity; Wood stoves are radiant/convection heaters and do not. Both wood stoves and pellet stoves work much better when installed with the intent to heat the floors space in which they are located but the wood stove tends to be far more common as a whole house heating appliance due to its heating properties