The ThermoMix boiler protection high-flow thermostatic mixing valve is used in hydronic heating systems with non-condensing boilers, including solid fuel, biomass, gas, LP or oil-fired. It can be
installed with steel, cast iron and copper tube style boilers,
automatically controlling the return water temperature, preventingcondensation of the water vapor contained in the flue gas.
The 280 series ThermoMix valve mixes bypass flow from the boiler
with return flow from the system, sending a fixed temperature flow to
the boiler which protects against corrosion from condensation
occurring when a minimum flue gas temperature is not otherwise
maintained.
Changable thermostatic sensor cartridges modifies valve temperature
setting. The thermostatic sensor cartridge can easily be
removed for maintenance or to change the valve set temperature,
with out removing the valve body from the piping.
Note: Image depicts threaded model
Note: Do not use this item for any installation or repair of potable water applications. This product does not comply with the "Safe Drinking Water Act," which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This item is for non-potable (non-human consumption) water applications only.
I'm a plumber in the Philadelphia area and there are many older homes that have hydronic heating systems. Many of which are from when high volume, gravity circulated systems were prevalent. This can often lead to trouble in the form of condensation when a modern boiler with a circulator is installed into this system.
The caleffi thermo mix solves this problem for me because when installed properly it circulates water through a system bypass until the boiler reaches 140 degrees, at which point it slowly opens allowing system return water to enter the boiler.
Hydronic boilers will condense below 130 degrees farenheight causing destructive rust and corrosion in the boiler blocks flue passages.
Joe The Plumber
Philadelphia area
2 years ago
Verified Buyer
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