# \[APP\]\[Pro\] OpenTherm GateWay MQTT

**URL:** <https://community.homey.app/t/app-pro-opentherm-gateway-mqtt/77190>\
**Category:** Apps\
**Tags:** app, homey-pro\
**Created:** [March 5, 2023, 8:32pm UTC](https://community.homey.app/t/app-pro-opentherm-gateway-mqtt/77190 "2023-03-05T20:32:37Z")\
**Posts on this page:** 1\
**Showing post:** 57

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**Author:** ![Gruijter](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gruijter/32/1973_2.png) [@Gruijter](https://community.homey.app/u/Gruijter)\
**Post date:** [September 8, 2023, 6:00pm UTC](https://community.homey.app/t/app-pro-opentherm-gateway-mqtt/77190/57 "2023-09-08T18:00:03Z")

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When I started the OTGW boiler tuning I hoped to save 5% gas by letting the boiler run more efficiently. Now that I have a full year gas consumption from July-July, I was able to compare it with previous years.

**We actually used 40% less gas than in previous years. WOW!**

Not all savings are due to tuning the boiler, but introducing OTGW on my Homey surely was a huge factor. These are the measures that enabled the 40% less usage:

- we had a relatively warm winter
- awareness by all residents that gas prices were enormous
- awareness forced by the shower timer I built with Homey (see OP)
- automatically lowering the boiler temperature to 40 degrees after 5 minutes of showering (and back to 58 when shower finished)
- installing a thermostat valve in the bathroom
- installing a thermostat valve in the hallway, and setting it to frost prevention mode
- installing radiator fans on all convectors in the living/kitchen area
- installed a new, better insulated, door between living room and hallway
- lowering the thermostat setting with 1 degree (to 19) and wearing extra sweater
- lowering the thermostat to 15 degrees an hour earlyer than before (9pm now)
- tuning the boiler:

- lowering max water temp to 45 degrees
- setting boiler heater power to minimum value
- fine tuning the max pump speed
- so that the return water temp is minimized, and boiler stays in low burner modulation as long as possible

This summer I found a cheap (18 euro) laser guided thermal temperature measuring gun at Lidl. I will use it when winter starts to fine tune the valves on each convector so that ‘delta T’ is equal everywhere. This will further optimize (=lower) the return water temperature, and thus squeeze maybe even a bit more efficiency out of the boiler.

Fine tuning the Central Heating system was very time consuming, but I never imagined we would save this amount of gas!

Hope I can inspire others to do the same.

PS: I read a lot online, discussed on forums, and watched youtube clips about boiler tuning. I have seen/read enough to know I am by far an expert on the subject, so please forgive me if some of the measures I described above are suboptimal, or even plainly wrong, but for me the result is there! 😉

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