I then went on to speak to the technician at Uponor and he was very confident that a 5/16 loop of 150' could easily be fed by even the smallest of pumps and that a ECO 16 should handle it easily. Like yourselves he questioned using such small Pex (5/16) but agreed the Star s 21 should improve the performance of the loop. I then spoke to the Wilo technician and he agreed that because the ECO 16 is a delta P pump with modulating circulation it was possible that the existing pump was throttling back when it encountered a high resistance. He recommended I replace the pump in the troublesome zone with a Wilo Star S 21. Given that I have thermostatically controlled zones the guy questioned why I had Stratos ECO 16 pumps. I spoke to the company who designed and built my hydronics board. Tell me you guys are serious about a towel warmer. When Chris suggested adding a nice towel warmer I thought he was joking but now I'm thinking it is a possible option. if i can provide any additional info let me know. One of my other concerns is that the Uponor EP manifolds have a maximum flow rate of 1.2 gpm on each port (the main manifold supports 14 gpm).Īny suggestion and info will be appreciated. I understand that a high delta T is usually the result of insufficient flow. In other loops I have checked my delta T's and they range from 20F to as high as 35F. In the one loop that I am most concerned about I have reduced the delta T to about 15F 0.4 gpm. A few people have suggested that a value of 10 - 15F is desired. The current pump supports 16' of head Loss. I believe that the head Loss for all 4 loops combined will determine the size of pump required for that zone. Can someone please calculate the Head Loss in this loop? The other 3 loops in this zone are similar or in one case greater. In the loop of greatest importance the total length, including the runup & return from the manifold, is 150' There are no fittings in this loop. The loops in this zone are 5/16 AquaPex set in Uponor QuickTrac. From what I have recently learned I question why delta P pumps would be specified on a thermostatically controlled system? There is also some suggestion that the pumps are too small which leads me to my next point.
![loopcad forum loopcad forum](https://c6.staticflickr.com/6/5762/31045681461_54bffcb148_o.jpg)
My zone circulation pumps are delta P pumps (Wilo-Stratus ECO 16). Here's the various components I am looking at with a bit of suspicion: Upon closer inspection my other four zones look a bit suspect although they do seem to be generating enough heat. However after a couple of days of constant running we still cannot generate the desired warmth and appear to be maxed out on that loop. This is sort of a continuation of my previous thread titled 'How much floor tubing' We did kinda' sort that issue out and, thanks mostly to UrthBuoy, managed to generate some heat in the zone.