# Any device to detect hot water usage? **URL:** \ **Category:** Devices\ **Created:** [February 26, 2024, 9:41pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997 "2024-02-26T21:41:20Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Mark\_Buikema](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/mark_buikema/32/17161_2.png) [@Mark\_Buikema](https://community.homey.app/u/Mark_Buikema)\ **Post date:** [February 26, 2024, 9:41pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/1 "2024-02-26T21:41:20Z")
Is there any device that can detect usage of the hot water line? I want to be notified when somebody turns on the shower. ---
**Author:** ![PeterHa](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@PeterHa](https://community.homey.app/u/PeterHa)\ **Post date:** [February 26, 2024, 11:05pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/2 "2024-02-26T23:05:08Z")
To detect if shower is turned on I would try it with a humidity sensor, e.g. from Aqara. That will not be a realtime notification, but should be within seconds. ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [February 27, 2024, 1:17am UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/3 "2024-02-27T01:17:57Z")
Yup, I’ve a humidity right above the shower head. Works great. Example to detect a (quick) increase of the humidity value: ![Screenshot from 2024-02-27 02-16-27](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/7/9776055c3504a951dd62e90facb74ac968e0bfdb.png) Also a (Aqara) water leak detector instantly reports the shower running. It has one disadvantage, it takes hours (overhere) for the floor to dry enough for the detection alarm to turn back to false. ---
**Author:** ![DirkG](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dirkg/32/118897_2.png) [@DirkG](https://community.homey.app/u/DirkG)\ **Post date:** [February 27, 2024, 11:20am UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/4 "2024-02-27T11:20:51Z")
If the drain is big enough… ![IMG_2926](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/3/c/3c45e6b3d1f4c30267194bdd3af809df0372f1c0.jpeg) (Aqara Water Leak Sensor, Source [Instagram](https://www.instagram.com/reel/CYHOz3Doaxp/?igsh=cWV5dnhseWZyd2Jv)) ---
**Author:** ![Eternity](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eternity/32/102113_2.png) [@Eternity](https://community.homey.app/u/Eternity)\ **Post date:** [February 27, 2024, 1:58pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/5 "2024-02-27T13:58:49Z")
As I use Plugwise for my heating, I can use the ‘state’ flowcard that indicates heating and warmwater usage whilst monitoring the central heater. I doubt you have Plugwise, but perhaps you have some other way of monitoring your boiler / heater. ---
**Author:** ![Glenn\_Seegers](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/glenn_seegers/32/8353_2.png) [@Glenn\_Seegers](https://community.homey.app/u/Glenn_Seegers)\ **Post date:** [February 27, 2024, 3:35pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/6 "2024-02-27T15:35:36Z")
I use a sensor on my watermeter and a temperature sensor on the outflow of my boiler. This way you kinda know how much hot water usage there is (takes a few seconds for the temperature sensor to go over the threshold i set so it’s not 100% accurate) ---
**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:** [February 27, 2024, 3:58pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/7 "2024-02-27T15:58:56Z")
I use the data straight from the boiler (combi-CV) using opentherm: > [@\[APP\]\[Pro\] OpenTherm GateWay MQTT](https://community.homey.app/t/app-pro-opentherm-gateway-mqtt/77190): > > Homey App Store (stable version): Homey App Store (test version): [OpenTherm Gateway MQTT App for Homey | Homey](https://homey.app/en-us/app/com.gruijter.otgw/test) There already was an app for OpenTherm GateWay, OTGW for short (many thanks for your work @nlrb !): [OpenTherm Gateway App for Homey | Homey](https://homey.app/en-us/app/com.tclcode.otgw/OpenTherm-Gateway/) I tried to install it on my new Homey Pro 2023, but that was a no-go. Installing on my older Homey did work, but the connection was somewhat unstable, and the functionality was too heavy for my application. HP2023 and MQTT support I found out … After 5 minutes shower the lights start to flicker, and after 8 minutes showering the temperature is regulated to an uncomfortable temperature. Works like a charm with my teenage kids! ---
**Author:** ![Glenn\_Seegers](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/glenn_seegers/32/8353_2.png) [@Glenn\_Seegers](https://community.homey.app/u/Glenn_Seegers)\ **Post date:** [February 27, 2024, 5:47pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/8 "2024-02-27T17:47:56Z")
That’s a great way for the kids indeed 😂 but what if if you have some private time with the lady under the shower?😂😉 ---
**Author:** ![Pixi](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pixi/32/109087_2.png) [@Pixi](https://community.homey.app/u/Pixi)\ **Post date:** [February 27, 2024, 6:00pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/9 "2024-02-27T18:00:19Z")
if the partner gets cold it is the right time to, “warm her/him” up ---
**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:** [February 27, 2024, 7:40pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/10 "2024-02-27T19:40:13Z")
> [@Glenn\_Seegers](#): > > what if if you have some private time with the lady under the shower? Not a likely scenario with teenage kids living in the house.😏 ---
**Author:** ![CasperV](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/casperv/32/37709_2.png) [@CasperV](https://community.homey.app/u/CasperV)\ **Post date:** [March 6, 2024, 5:05am UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/11 "2024-03-06T05:05:18Z")
I have a smart plug at my CV, and when the hot water runs, the power is always higher than with standard heating. In this way I detect the hot water. Homewizard via a virtual device then measures the amount of hot water. And, of course, if someone flushes the toilet then that’s counted as hot water too… ---
**Author:** ![Eric\_B](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eric_b/32/10238_2.png) [@Eric\_B](https://community.homey.app/u/Eric_B)\ **Post date:** [March 7, 2024, 8:24pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/12 "2024-03-07T20:24:53Z")
I installed a flow-sensor in the hot-water pipe of the shower. After 5 minutes 1 of the hue lights in the bathroom starts to blink. 2 minutes later a Popp water-stop turns off the hot water in the bathroom. If the watertap is turned off during showering, the timer pauses. Ofcourse you need the space to install the sensor and the flow-stop. An advanced flow handles the complete process including a manual override button if I want to shower a little longer. ---
**Author:** ![DirkG](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dirkg/32/118897_2.png) [@DirkG](https://community.homey.app/u/DirkG)\ **Post date:** [March 8, 2024, 12:46pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/13 "2024-03-08T12:46:05Z")
> [@Eric\_B](#): > > 2 minutes later a Popp water-stop turns off the hot water in the bathroom. 🚿⏱✋🏼🥶 😂 ---
**Author:** ![Eric\_B](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eric_b/32/10238_2.png) [@Eric\_B](https://community.homey.app/u/Eric_B)\ **Post date:** [March 8, 2024, 3:42pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/14 "2024-03-08T15:42:04Z")
Don’t worry….it’s a thermostatic valve, so no hot water is no water at all… 😉 ---
**Author:** ![Mark\_Buikema](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/mark_buikema/32/17161_2.png) [@Mark\_Buikema](https://community.homey.app/u/Mark_Buikema)\ **Post date:** [March 13, 2024, 9:30am UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/15 "2024-03-13T09:30:08Z")
Which flow sensor do you use? ---
**Author:** ![Eric\_B](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eric_b/32/10238_2.png) [@Eric\_B](https://community.homey.app/u/Eric_B)\ **Post date:** [March 13, 2024, 8:25pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/16 "2024-03-13T20:25:45Z")
I use the flow sensor from intergas connected to a fibaro smart implant. ![IMG_0924](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/4/3/438a9d7e8be6c8c59037e9851c8bdf392bf6cd06.jpeg) ---
**Author:** ![buldm01](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/buldm01/32/7885_2.png) [@buldm01](https://community.homey.app/u/buldm01)\ **Post date:** [July 14, 2024, 9:28am UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/17 "2024-07-14T09:28:25Z")
Do you also have a connection diagram for this? ---
**Author:** ![Eric\_B](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eric_b/32/10238_2.png) [@Eric\_B](https://community.homey.app/u/Eric_B)\ **Post date:** [July 14, 2024, 4:27pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/18 "2024-07-14T16:27:31Z")
It’s a very simple diagram Just connect a 12VDC powersupply to wires P (red +) and GND (blue -) and connect the flowswitch to wires GND (blue -) and IN1 (yellow) of the Fibaro Smart implant. Be sure to isolate all the other wires. In the settings of the implant set the type of IN1 to Normally Open Contact and you should be good to go… ![IMG_1782](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/3/0/30dfdcaa7c389e7a94ed23fe44499f4e38f5ce2a.jpeg) ---
**Author:** ![buldm01](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/buldm01/32/7885_2.png) [@buldm01](https://community.homey.app/u/buldm01)\ **Post date:** [July 20, 2024, 11:33am UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/19 "2024-07-20T11:33:08Z")
ordered everything. connected and it works perfectly. I get a notification when it turns on. then it goes right back out. So I can’t check whether it is still running or not. ---
**Author:** ![Eric\_B](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eric_b/32/10238_2.png) [@Eric\_B](https://community.homey.app/u/Eric_B)\ **Post date:** [July 20, 2024, 2:59pm UTC](https://community.homey.app/t/any-device-to-detect-hot-water-usage/104997/20 "2024-07-20T14:59:53Z")
Please check: - did you set input-type 1 to normally open - If you open the device, is the icon on Alarm 1 colored red with a big YES while the water is running? - did you install the sensor in the right direction? There is an arrow on it for the flow-direction. ![IMG_1826](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/5/959234ecc22f3daf53d4024058bd6e749f841744.jpeg) ![IMG_1821](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/7/97c6bd4a3f2a845292ead0b4a5d7e0db8060e995.jpeg)