# VVB tomt for varme etter 12h? **URL:** \ **Category:** 🇳🇴 Norsk (Norwegian)\ **Created:** [December 6, 2022, 9:50pm UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211 "2022-12-06T21:50:21Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Psieger](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/psieger/32/57437_2.png) [@Psieger](https://community.homey.app/u/Psieger)\ **Post date:** [December 6, 2022, 9:50pm UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/1 "2022-12-06T21:50:21Z")
Hei, Hope its ok to write english. I understand Norwegian but cant write well. I am new to homey and own a bridge. I connected a heavy duty switch to the VVB (brand new osa saga 200L). My flow looks like this (how to share flows so they show up so nicely?): When the price changed (tibber), And time is between 01 and 06 am, and price is one of 7 lowest today, Then turn vvb on, else turn vvb off. The flow seems to work, but after setting it up the water is considerably colder. At around 8 in the evening there is no warm water anymore. Even though the switch was on half the night. Can a vvb loose all its heat in just 12 hours?? The wife already dislikes the smart home idea because of near cold showers… Urgent help is needed😄 I did turn the blandeventil up, so the water should be 50 degrees at the shower. At the same time, i turned the temperature in the vvb from 75 to 70. Any ideas whats wrong here? Takk ---
**Author:** ![Jan\_Hoydahl](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jan_hoydahl/32/53324_2.png) [@Jan\_Hoydahl](https://community.homey.app/u/Jan_Hoydahl)\ **Post date:** [December 7, 2022, 8:22am UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/2 "2022-12-07T08:22:17Z")
You need to heat during the day as well. We have 200L and a house of four. After heating in the night there is enough hot water for 2-3 showers (we have a 20years old heater). My logic is quite simple. I allow it to heat during the 18 cheapest hours a day, and stop it during the 6 most expensive hours. Always hot water available! There is a risk that the price profile for a day has more than 6 very expensive hours, but it’s better than it was, so there is always a balance. If I had access to the water temperature I’d probably tried to make a more intelligent algorithm, i.e. if the water temp is below 50 C or something, I’d accept a higher price, unless noone is home etc 🙂 But I keep it simple. ---
**Author:** ![Psieger](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/psieger/32/57437_2.png) [@Psieger](https://community.homey.app/u/Psieger)\ **Post date:** [December 7, 2022, 11:13am UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/3 "2022-12-07T11:13:53Z")
Thanks Jan, it’s a simple flow that surely works. I like to specify certain times to avoid getting into a higher effekttrinn. But so far it’s not successful anyways. I might try that the vvb is on during the 9 cheapest hours. Like that it is surely on in the night and maybe during a dip in the day. Other question, does the vvb refill itself with cold water when it has no electricity? ---
**Author:** ![leiet](https://avatars.discourse-cdn.com/v4/letter/l/f1d935/32.png) [@leiet](https://community.homey.app/u/leiet)\ **Post date:** [December 7, 2022, 9:34pm UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/4 "2022-12-07T21:34:59Z")
Hei, har du mulighet til å vise hvordan denne flowèn er satt opp? ---
**Author:** ![Psieger](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/psieger/32/57437_2.png) [@Psieger](https://community.homey.app/u/Psieger)\ **Post date:** [December 8, 2022, 7:32pm UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/5 "2022-12-08T19:32:15Z")
Here is my flow that i use. Now i have to water even in the evening. [https://homey.app/f/tMLdPj](https://homey.app/f/tMLdPj) ---
**Author:** ![Psieger](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/psieger/32/57437_2.png) [@Psieger](https://community.homey.app/u/Psieger)\ **Post date:** [December 8, 2022, 7:35pm UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/6 "2022-12-08T19:35:35Z")
But the VVB used 8kwh last night and was on from 1am to 5.20am. Kinda much i feel. I wonder if this makes it all more expensive. Maybe the water cools so much that its better to heat a little in the day aswell even though the price is higher. Any experience with this? Is it possible to set up a flow that shows the kroner amount a device used? All data is there (tibber and kwh usage). But how to make homey calculate it? ---
**Author:** ![Psieger](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/psieger/32/57437_2.png) [@Psieger](https://community.homey.app/u/Psieger)\ **Post date:** [December 16, 2022, 10:47pm UTC](https://community.homey.app/t/vvb-tomt-for-varme-etter-12h/73211/7 "2022-12-16T22:47:49Z")
I tracked the vvb for one week. It was on on average for 3.9 hours each night and used an average of 6.65kwh each night. See photo. I now test that its allowed to be on during the 12 cheapest hours of the day. Will report next week. ![IMG_20221216_233814](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/6/f/6f0c9caf3fbb91a6552793b61380a47cfb2a0320.jpeg)