Hot water cylinder smart thermostat

[Michael Groves]

I’m looking for a Hot Water Cylinder Smart Thermostat. But I want to be able to monitor the tank temperature over time so I can see when the hot water is being drawn off and how quickly it recovers. So maybe recording the temperature every 5 minutes and saving this data.

Does such a thing exist?

 

[Michael Groves]

Secondary I don’t believe can be plastic

There was a lot of debate about plastic, I recall the Hep2o spec advises it has not been tested on secondary. However, Hep2o technical advised it had been tested above the pressure required for secondary return so it should be okay, but as it just has not been tested they can’t warrant it will be okay. Ultimately it’s up to you. I was given the scenario, and told it was up to me as customer to make final decision. I agreed to go with Hep2o as I believed the performance and spec supported this. The only caveat was it’s just not been tested.

 

[Michael Groves]

Yes, most standard plastic pipe clips will just about allow 13mm wall thickness insulation to be fitted around the pipe if you wanted the insulation to be thicker then you needed to spec it or let then know that was your intension.

Fair enough, to be honest I’d not considered lagging until the install was finished. Then the day we tested I was amazed at the temperature drop so got it lagged to death.

 

[ShaunCorbs]

not rated for secondary returns

Push-Fit Hep2O: Your plumbing FAQs answered - Part 1

Can I use Hep2O in a continuously operated re-circulating system?
No. Continuously operated re-circulating systems (Secondary Hot Water Circulation/Ring main installations) are very different from conventional hot water supply and central heating systems found in domestic properties, for which Hep2O products have been tested.

 

[chris watkins]

The problem is not with the pressure or even the temperature it is the fact that it is oxygenated water which if circulated all the time has been shown to break down the plastic over time.

 

[chris watkins]

"Continuously operated re-circulating systems are very different from conventional hot water supply and central heating systems found in domestic properties, for which our products have been tested to, under either BS 7291 2010 Class S or WRAS approval standards, and for this reason Hep2O products must NOT be used on any continuously operated re-circulating systems as they are not approved under the current version of these standards."

Page 59 Installation Guide.
You would have thought that the technical department would have followed their own published advice wouldn't you?

 

[Michael Groves]

Hep Technical pointed out it had not been tested, so they could not guarantee it would work. But also pointed out as it had not been tested they could not say that it would not work. If the customer chooses to use it, it is at their own risk.
What would be good if they could actually test it and say either way for sure.

 

[Michael Groves]

The problem is not with the pressure or even the temperature it is the fact that it is oxygenated water which if circulated all the time has been shown to break down the plastic over time.

But doesn't barrier pipe solve that problem ?

 

[Michael Groves]

Is this a rented property?

Yes

 

[ShaunCorbs]

They have tested it and it split

Any leaks on your hot water sys?

 

[Michael Groves]

I was told it had not been tested!

I'm not aware of any leaks, we have newly painted lath & Plaster ceilings so I'm sure if there were we'd know about it.

Its been running for about 17 months, I might send Hep my test results 🙂