Help with eph r27 and cylinder thermostat
We have a Glow Worm Energy 18s boiler with the following control system:
https://drive.google.com/file/d/18EfZF0DIOBtxWuHFIiVSJj80KLKqL7e7/view?usp=drive_link
The panel connected to the boiler controls the scheduling of the upstairs heating and the hot water. Upstairs there's one wired thermostat that controls the heating in all rooms. Downstairs, there are three separate wired thermostats that control the underfloor heating in different areas.
We have already put TVRs in the heaters upstairs, but they only work if we manually set the existing thermostat on, otherwise the boiler is off. But, if this thermostat is on and all bedrooms have the desired temperature, the boiler stays on and we can feel the hot pipes under the floor. Is it possible to replace this thermostat with a tado one that would only switch the boiler on if one of the TVRs require heat?
Then downstairs, tado support says that our system is not compatible because there's a cylinder thermostat in the hot water tank that the tado controller doesn't support. The cylinder thermostat has a radial to manually set the temperature. From what I understand, the only reason it's connected to the controller is so the boiler can be turned off if the water has reached the right temperature. But if we were ok with the boiler always being on when water heating is scheduled, could we just leave it as it is and install the tado thermostat with hot water control?
https://drive.google.com/file/d/18EfZF0DIOBtxWuHFIiVSJj80KLKqL7e7/view?usp=drive_link
The panel connected to the boiler controls the scheduling of the upstairs heating and the hot water. Upstairs there's one wired thermostat that controls the heating in all rooms. Downstairs, there are three separate wired thermostats that control the underfloor heating in different areas.
We have already put TVRs in the heaters upstairs, but they only work if we manually set the existing thermostat on, otherwise the boiler is off. But, if this thermostat is on and all bedrooms have the desired temperature, the boiler stays on and we can feel the hot pipes under the floor. Is it possible to replace this thermostat with a tado one that would only switch the boiler on if one of the TVRs require heat?
Then downstairs, tado support says that our system is not compatible because there's a cylinder thermostat in the hot water tank that the tado controller doesn't support. The cylinder thermostat has a radial to manually set the temperature. From what I understand, the only reason it's connected to the controller is so the boiler can be turned off if the water has reached the right temperature. But if we were ok with the boiler always being on when water heating is scheduled, could we just leave it as it is and install the tado thermostat with hot water control?
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Comments
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@bellota
Your boiler's installation guide is clear. https://www.glow-worm.co.uk/glow-worm/product-manuals/energy-3/system-5/energy7-system-installation-and-maintenance-instructions-1948947.pdf
Around page 25, it describes itself as a digitally controlled boiler. Unfortunately the engineers who fitted the thermostats and electrical controls did not think make use of that and wired the boiler in dumb mode, which wastes energy.
I suggest you contact Tado, inform them of your specific boiler model, explain that
* it has two CH zones,
* one HW zone
* one of the CH zones has underfloor heating with 3 wired thermostats
* the other CH zone has one wired thermostat.
They will likely recommend you replace all the wired thermostats with smart Tado ones and also fit an extension kit, configured in D07 mode to manage the boiler.
They should send you instructions to change the boiler wiring to run in Ebus mode.
You may need to get a sparkie to read the install manuals for the boiler, the instructions from Tado and then update the cabling at the zone valves as well as at the boiler and the underfloor heating manifold so it all hangs together well.
Your sparkie may then recommend another cylinder stat that talks the same digital language as your boiler. If he can't come back here. We can try and help on that.
In this edited state, with these changes,
your boiler will operate far more efficiently - the Tado system will engage features in the boiler which have not been used so far and will save money.
Your sparkie can also set up the upstairs zone to open when there is any call for CH heat, anywhere, so that the rad stats then control upstairs water flow directly. This will enable you to bring every room under control of the app and within 1 month you should see significant cost improvements.2 -
Thanks for the very detailed answer. We've engaged with tado support again with these details and are getting somewhere. Will come back here with the results.0
