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Changing to a DIY Shelly Sensible House – Half 3 – Digital Scorching Water – Automated House


In Half 1, buddy of Automated House, MarkB, began to transform his good dwelling over to utilizing Shelly modules and in Half 2 he created a wise EV charger. This time he upgrades his home sizzling water system…


Now we have put in Drayton iTRV’s with a 3 channel controller, one zone for the residing house, one for the bedrooms and the third zone for warm water, you possibly can examine that right here.

While we now have management of the heating through the iTRV’s and Wiser room thermostats, the new water depends on a easy schedule and a conventional bimetallic swap on the new water cylinder. This looks like an apparent space Drayton may supply the home-owner an improved sensor to digitise the management of the new water and provides visibility of the tank temperature, nevertheless it additionally offers us one other Shelly venture.

Just a few issues exist with the present setup. The recent water is on a hard and fast heating schedule, bringing the boiler on early  within the morning and late afternoon to warmth water. If somebody makes use of quite a lot of sizzling water in the course of the day then the boiler on part is probably not lengthy sufficient to supply ample warmth to recuperate the new water cylinder. Likewise if numerous sizzling water is used after late afternoon somebody must set off a lift cycle. 

I even have a Photo voltaic iBoost that may divert surplus energy from my PV set up to an immersion heater. There are occasions when the water from the faucet is scalding but the boiler nonetheless comes on to warmth the water. This might be brought on by distinct stratification of the water or the inaccuracy of the bimetallic thermostat swap. Both method I used to be burning gas when it might be averted.

The search was on for extra management however with out getting over difficult or costly and Shelly would offer the reply. The Shelly Add On modules enable the addition of temperature probes or exterior switches. These modules piggyback a Shelly 1 or Shelly 1PM and connect with the GPIO header.

We lined utilizing Shelly units to make a good gentle or a good EV charger and for this venture I’ll use Shelly 1 once more however this time with the addition of a temperature add on module.

Shelly Smart Home Control of Hot Water
Shelly 1 with Temperature Add On and temperature probes

The Shelly Add-on Module 

I’ll begin this with the standard warning – That is an illustration of how I’m utilizing Shelly units and it isn’t an in depth tutorial. Mains Voltage can kill, trigger critical harm or injury to property and tools. Please make sure you solely conduct work you’re competent in or educated to take action and adjust to native laws. 

I equipped the Shelly 1 with an area 240v provide to energy the gadget. I related the earlier thermostat connections to the volt free enter and output contacts of the Shelly 1. As soon as all the principle connections have been made it was time to clip on the Add On. It has three fly cables that I’d join the three temperature probes to through 3 Wago connectors. Spring loaded connectors have been equipped within the bundle however my habit to Wago meant I used them as they felt extra sturdy. I often use bootlace ferrules on stranded cables to make sure a very good connection and no stray strands, particularly when utilizing very high quality gauge cables.

Shelly DWH Tank Control
320L twin coil sizzling water cylinder with 3 thermo pockets – AND – Shelly 1 with Add On and three temperature probes related

As soon as related the Shelly App routinely recognises the presence of the Add On and the temperature probes and new choices might be out there on the gadget dashboard.

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Shelly 1 menu expands so as to add Exterior Sensors and Temperature Automations – AND – Temperature Probe setup choices

Subsequent is to arrange the temperature sensors by setting the measurement models, in my case Levels Celsius. Then it’s time to call the sensors, on this setup it’s merely High, Center and Backside. The High measures the temperature on the output of the cylinder, the Center was the placement of the normal bimetallic swap and the Backside was a spare pocket on the cylinder meant for photo voltaic. These three probes would give me a very good overview of what was occurring with the cylinder contents.

Subsequent step was to make use of the Temperature Automations to show the relay on and off. I picked 65 levels because the off temperature and 40 because the on temperature. This now meant I had changed the earlier thermostat with a extra correct setup and I’d have visibility of the water temperature developments. 

The subsequent a part of the issue was to make sure the boiler comes on if the cylinder dropped beneath the minimal temperature. That  would require a second Shelly 1 wired in on the boiler. I had designed and constructed a controller that might carry on the boiler and open one of many three zone valves based on which zone referred to as for heating. This meant working cables to the zone thermostats years in the past however now with Shelly these cable runs might be changed with Shelly units, isn’t progress great!

shelly hot water 4 3
Valve and boiler controller for 3 zones – AND – Relay for Zone 3 sizzling water exchange with a Shelly 1

The controller makes use of three standard relays however now the new water zone relay would get replaced by a Shelly 1. Each time this Shelly was turned on the boiler would hearth and the new water zone valve would open. The reside output from the Drayton Wiser can be used because the Swap enter to the Shelly 1, replicating the present performance. 

With this Shelly 1 in place I may additionally used the Direct Gadget to Gadget performance.  When the temperature dropped beneath 40 levels on the Center temperature probe I may inform the gadget on the boiler to activate whatever the Drayton Wiser schedule.

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Direct Gadget to Gadget management setup – AND – Visibility of temperatures and development information out there for downloading and additional evaluation

This venture  illustrates the ability of Shelly, with the ability to join separate units in an correct and logical vogue. This additionally offers us extra management, consolation and vitality effectivity.

Keep tuned for extra good situations with Shelly units on the coronary heart of the answer.

Final replace on 2023-05-28 / Affiliate hyperlinks / Photos from Amazon Product Promoting API



2 thoughts on “Changing to a DIY Shelly Sensible House – Half 3 – Digital Scorching Water – Automated House

  1. I do trust all the ideas you’ve presented in your post. They are really convincing and will definitely work. Nonetheless, the posts are too short for newbies. May just you please lengthen them a bit from next time? Thank you for the post.

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