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Gravity fed system with no thermostat - Sanity check wiring plan

johnmolly92
johnmolly92 ✭
edited November 2023 in General Questions & Topics

Hi All, I just wanted to post here and sanity check my proposed wiring before installing.

We currently have a gravity fed system with no thermostat installed. Controlling both hot water and heating is done via a simple timeclock wired into the switched live on the boiler. When the timeclock is switched on both hot water is sent to the rads with TRV's and the old hot water cylinder. There is no thermostat on the hot water cylinder, it just keeps on heating as long as the boiler is on.

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I have orderd the wireless starter kit, and based on the Y plan Tado wiring diagram I have come up with the proposed wiring below. With the HW NO terminal connected to the CH NO terminal/boiler switched live (red wire below).

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My reasoning for trying to use the wireless programmer in Y plan mode with both HW and CH relays wired to the switched live, rather than the programmer set to relay mode on the CH relay, is to be able to call for both HW and CH independently in the app. Without knowing the ins and outs of the Tado software, my thoughts behind this are in the summer when the house is hot the boiler may not switch on for hot water is the CH temp sensors are already at temperature.

Can anybody with a bit more experience validate this plan for me please? Is there an option in the app to boost hot water when in relay mode regardless of the room temps? i.e if theres a schedule to heat hot water for an hour in the morning it will close the CH relay when set to relay mode. Maybe the Tado software is smart enough to do this in a less complicated way than my diagram above.

Appreciate any inputs people have!

Thanks,

John

Best Answer

  • johnmolly92
    johnmolly92 ✭
    edited January 9 Answer ✓

    Ive received a few DM's about this post so I wanted to add an update.

    I installed the V3+ Programmer as shown in the diagram above, and configured it in "Relay (S-Plan & Y Plan)" using the Tado Pro app.

    This has given me the ability to control both Central Heating and Hot Water independently in the app as described above. The caveat of this is due to my outdated "dumb" gravity fed heating system, the Hot Water is always being heated when either CH or HW is being called for in the app.

    During the Summer this allows me to set the HW schedule to kick on in the morning, when the CH will not be calling for heat as the rooms are at temp already. In the winter the HW schedule is redundant as the rads are calling for heat during the day and this is constantly topping up the hot water tank.

    Although I'm not getting the full benefits of the smart individual CH/HW smart control Tado provides with a modern S/Y plan system with a thermostat on the hot water tank. I'm happy with extra control this solution provides with controlling the scheduling of the Boiler in the app.

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