![]() garage, do you need manifolds with balancing valves on them?” he asks. Halter offered a practical example from the real world where all your loops aren’t going to be the same size. It has a flow meter/balancing valve incorporated into the high side so you can actually turn it and control your flow rate.” The first thing I did with Caleffi when I started five years ago was to help introduce the TwistFlow to the marketplace. “The science of manifolds has flattened out to where there’s not going to be too much newfangled you can do with it. Is the integral balancing valve the newest thing in manifolds on suppliers’ shelves? In most situations, you really want to use a manifold that has balancing valves on it.” Try as you might, you are going to have different tubing lengths in your loops. Runyan agreed: “I think it’s best if you have it. “In the first example I talked about there were four 250-ft. “Yes you do, especially if you have a lot of different sized loops,” Halter says. You buy it preassembled from the factory.” “You can buy them in pieces so you have to put them together or, with today’s modern manufacturing, many major manifold manufacturers are offering them with the supply manifold connected with a bracket so they can be easily mounted on walls. “TwistFlow, for example, can be had in three circuits up to 13 circuits,” he says. Also consider the number of circuits you’ll require for your project. ![]() ![]() Price is an important consideration, as is the type of material you choose, he adds. From Btu he can back down to flow rate and that is usually somewhere from one to five gal. A guy is going to know - or should know - what his heat load is. “The other thing to be leery of is the feet per second of velocity to make sure you don’t erode anything. In our catalog, that would be either 1 or 1 1/4 in.,” Dickenson says. “And what I’m talking about is the entrance from the primary source of heat. Caleffi offers the TwistFlow manifolds for radiant applications. For sizing, generally one size fits all applications,” says Woody Dickenson, Caleffi product manager. “A manifold is a good thing to always think about when you’re in a multiple zone situation. If your manifold is located in the center of your home, trying to get all the pipe to come together there could create some excessive heat in that location.” “All jobs are different, so it’s difficult to give rules-of-thumb. “I think he first should consider the loop layouts and, therefore, whether it’s better to have one manifold with all of your loops running to a single spot or is it better to have two smaller manifolds,” Runyan says. Zurn PEX makes three manifolds for radiant heat: a stainless-steel model, the QickZone modular manifold and the AccuFlow preassembled brass manifold. Gary Runyan, Zurn PEX manager of product development and engineering, says this factor can be critical. The first thing a contractor may want to consider when shopping for a manifold is to have a plausible layout for the system already in hand. Choosing the right radiant manifold isn’t quite as easy as one who holds the belief that manifolds are just dumb mixing blocks may think. One stream of water or other fluid goes in and gets directed to several other areas. ![]() It’s sometimes easy to think of a radiant manifold as simply a dumb box. ![]()
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