Managing hot water with Combi on Opentherm - Using energy?

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Floob
Floob ✭
in General Questions & Topics

In order for the hot water temperature to be configurable whilst my boiler is in opentherm mode, it requires that I manage that through Tado. So I have the hot water icon in Tado now and can adjust the temperature.

But given it is a combi, is there any issue with the hot water schedule in Tado showing as enabled 24/7 - I mean it should only use energy if I use the tap? Its not like its heating it all the time even though the app has the schedule as running hot water at 50 degrees all day?


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  • Floob
    Floob ✭
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    Thanks for that. This is what I wanted to hear:

    "Your system is ONLY HEATING your hot water when you turn on a tap"

    I was thinking that under 50 degrees could cause bacteria like legionella, but then I guess thats more for standing water rather than combis. I'll play with it a little and see what temp suits best. Thanks for your help.

  • SergG
    SergG ✭
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    I'm current researching wiring for hot water for my Greenstar Si Compact ErP. And decides to add a question to this slightly older post.

    My boiler is already connected for heating to Tado and is working fine, but I want to control ECO mode shedule as well. Professional installation guide for Wireless Smart Thermostat [Incl. Programmer with Hot Water Control] Manual explains 3 modes - S-mode, Y-mode and Combi. I wonder which one I should use with my Combi. Boiler details - https://www.worcester-bosch.co.uk/products/boilers/directory/greenstar-si-compact


    Here is an update for everyone who has a similar question - pre-heat hot water in a combi boiler:

    Why might I want to programme hot water times with my combi boiler?

    Worcester's range of wall-hung Greenstar gas combi boilers all feature a 'domestic hot water preheat' function.

    When this pre-heat function is on, the length of time taken to receive hot water at a tap will be reduced as the boiler will have been kept hot in readiness for a demand.

    If this function is off, the boiler will only ignite to warm the water once the tap is opened. This means delivery to the tap will take a little longer but energy will have been saved in not keeping the boiler preheated.

    For more details please read this guide - https://www.worcester-bosch.co.uk/support/troubleshooting/faqs/all-faqs/why-might-i-want-to-programme-hot-water-times-with-my-combi-boiler

  • johnnyp78
    johnnyp78 ✭✭✭
    edited October 2022
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    You’ve got a combi so s plan and y plan are irrelevant, those are for hot water tank systems. How is the wireless receiver wired - relay or Opentherm/ebus? If it’s relay then you control the hot water on the boiler, so it’s up to you whether or not to turn preheat on. If it’s digital then the preheat function may get overridden by Tado to be either permanently on or unavailable, depending on the boiler.

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