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Building with Concrete: What is Concrete Made of; Concrete Mix Designs; Decorative Mix Design; Hot Weather Concreting; Cold Weather Concreting; Concrete Admixtures; Ordering Concrete; Subgrades & Subbases; Building Concrete Slabs; Preventing Concrete Cracks; Concrete Joints; Green Building With Concrete; Polyaspartic Coatings; Surface Preparation; Curing Concrete; Concrete Demolition; Vapor Barriers
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System Description - Hydronic

The heating element in a hydronic system is a closed-loop tubing made of a flexible polymer (typically a cross-linked polyethylene) or a synthetic rubber that circulates a mixture of hot water and propylene glycol (antifreeze),much like the mixture used in a car radiator. The fluid is warmed to temperatures of 140 to 180 F to providesufficient heat for snow melting. The tubing ranges in diameter from 1/2 to 3/4 inch and is flexible enough to bendinto various layout patterns. Its also designed to have a long service life. The tubing resists chemicals andcorrosion and does not become soft at high operating temperatures or brittle at low outdoor temperatures. "Weoffer a 25-year warranty on the performance of our product," says Bill Bailey of Lee Hydronics, an installer ofhydronic tubing manufactured by Wirsbo.