Installing PEX System for Cold and Hot Water Circulation: Comparing Wavin and Kisan Sizes

Question

Hi, I am preparing to install cold and hot water with circulation in PEX system. I found these diagrams in Wavin materials: I was initially planning to do the circulation as follows: However, example 3 from the first diagram solves the problem of lack of circulation on the section tee - faucet...

Plumpi · Accepted Answer

What kind of reducer do you have in mind? If a pressure regulator then it is mounted on the main pipe supplying both cold water and hot water circuits. Any stainless steel or plastic manifold can be used for domestic water. There is a large selection in plumbing wholesalers. You can always buy PP connectors and grommets yourself, or buy tees and stainless nipples and screw them together. The only thing you need to know is that when doing an installation with manifolds, you must use 3 manifold strips. One for cold water and two for hot water (supply + circulation). There are 3 pipes to each faucet.

Zutket · Answer

It is a very good idea to do the installation in accordance with figure 2.Admittedly, the cost at the beginning is greater, but in operation very useful. Especially when you need to repair from any of the taps. Instead of dumping water from the whole installation, you close the circuit in question and make the repair.
What about circulation. It all depends on the distance of the shower from the hot water tank. If small, then circulation is rather unnecessary and unnecessarily generates costs. The cost of running the circulation pump, the cost of heating the water after cooling in the circulation.

codigo · Answer

I initially considered this, however, I could not find anywhere manifolds with PZH certification that can be used for domestic water. In addition, with this approach, there is still the problem of cooled water on the section manifold - faucet. There will be faucets tightened to the elbows established, so there will be no need to dump water from the entire system. The distance is significant, so the circulation is necessary, especially since the wastewater is discharged to the septic tank. Circulation I want to do to each hot water point. I plan to use a Leszno Erga pump with a maximum power of 9W, so the cost of powering it will not be significant. Of course, as you wrote, it is necessary to reckon with the need to heat the water cooled in the circulation.

codigo · Answer

I made a mistake when writing the answer - it was supposed to be distributor - battery. I corrected the post. Won't we have an analogous problem with such a solution, as in the case of several risers with circulation and the lack of balancing valves on the circulation pipe in each riser, only that on a micro scale, that is, the longer the pipe from the faucet to the circulation manifold, the worse the exchange of hot water? I come to the conclusion that the best solution in terms of circulating efficiency will be a tee system, in which directly to the tee there will be a fixed elbow, to it a faucet, and then a hose and a faucet. I just don't know if this is the way it should be done. And if not, why not?

romano78 · Answer

I did the hot water on manifolds and it is a good option if there is one bathroom if there are more then I prefer on Trojans.And everyone does according to figure 4 at least in my area , complicate yourself installation for about 2seconds I do not know if it is worth it.

Plumpi · Answer

The plumbing in the house is too small to need balancing valves. But here you have not discovered anything new, because this is how it is done. There are even special elbows with a foot with 2 approaches or whole strips, both in the Pex system and PP But I'll tell you that doing Pex the easiest way is to go around the room in question in a loop along the floor with 20mm pipe, and from this loop you go off in straight sections of 16mm under the valves to the faucets. For this purpose, you install reducing tees Pex 20-16-20 Since the approaches are now made under sinks, the length of a single pipe from the loop to the valve does not exceed 1m. This is a really small section. Especially since hot water will circulate by gravity anyway in this vertical section of 16mm pipe. The circulation loop pipe is laid between the first and second layers of Styrofoam. Added after 2 [minutes]: Only why make a manifold for one bathroom? If you make a manifold is on the principle of successive circuits to successive rooms, and in a particular room already branched by tees.

codigo · Answer

What conditions must occur for balancing outlets to be justified and needed? I wrote about this in the first post - the problem I see is the lack of such elbows/strips with a larger diameter at the entrance. Here we have 20, and, for example, for a shower with a rain shower a larger diameter is needed. In this situation, I guess the only thing left to do is to do as I wrote, that is, to make something along the lines of such an elbow/leaf yourself.

doromik · Answer

I have had gravity circulation for 20 years and it works. No pumps, no valves. Just return taps from the risers made with pipes of smaller diameter. It is advisable to have one throttling valve before the very return to the boiler so that the consumers are not supplied with cold water. He replaces the one-way valve, which at b. low flow rates does not work. Fact; it is impossible to control the flow as with a pump and it is also difficult to estimate heat loss. The solution is not for the perfectionist, but there is a holy peace of mind. I recommend.

Installing PEX System for Cold and Hot Water Circulation: Comparing Wavin and Kisan Sizes

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