Discuss Indirect Unvented cylinder, Combi Boiler and Nest Thermostat in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Any pictures of under the boiler, 2 port valves etc around the cylinder
It is insulated, not they way most would do it but I don't think it specifies anywhere what standard if insulation must be used?
Never gets below around 15 degreesIt's about appropriateness. If that space get s down around freezing then it needs better protection.
If however it's to protect against rodents, then that works brilliantly as they don't like the fibrous nature of it and leave it alone... Instead they use the polyplumb elbows to sharpen their teeth
I am surprised if MIs state just 28 minutes for that cylinder reheat.??? I would have thought it is much more.
The hot water outlet on unvented cylinders I prefer to drop the pipe before ever raising the pipe to a higher level. Just raising a hot outlet will mean some of the stored heat from the cylinder will keep heating the water in the raised pipe, therefore wasting energy.
20kw going into the coil will re heat in around 30 mins
35 minutes for full reheat, is what I read on 250l indirect.
Not bad, if that's correct.
I have one installed isn't achieving that
That was indirect. My cylinder is 250lThat's the direct on have a look at the indirect spec
Size of boiler ?
30kw WB gas boiler. It is my partners house, so something I am aware of. Pipework all mine, except the gas, so no bother there.
I need to investigate it more.
How can the flow rate be confirmed/checked?What flow temp is that at tho?
I've just installed twin 150L OSOs and they state recovery rates at 80 degs flow!! Still, makes it look good
apologies for my ignorance, I am not technical at all.Its the boiler flow temp that OSO quote at 80 degs. Most boilers closer to 70 so recovery rate way longer than stated depending on coil design (ability to transfer heat).
The cylinder will only heat up at the time in the instructions in ideal conditions. Unlikely in real world situations. Time the hot water to be on without the heating so it's coil gets the boilers full output and it won't take too long. Have the heating on and it will get a share of the boilers output. Best to set hot water to come on one hour before heating times.
We now fit a circulating pump on the hot water from the cylinder. Combi heats it fine, all hot water taps from cylinder so no time lag. Put circulator on a ceiling mounted proximity sensor so that runs for 15 minutes when activity in the bathroom area. The kitchen sink near enough not to need circulation.
That’s also what we were saying mateCombi on unvented is fine. If you’ve got your 2 port valve and all other G3 kit installed correctly then there nothing wrong with that at all. Assuming it’s installed correctly the coil is just like another radiator
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