Wiring a relay?...................

[Dave OCD]

I think I'd have talked her into a simple 24 hour timer, instant wifi access to something that needs a good hour to warm up seems a bit ott.

 

[DPG]

I think I'd have talked her into a simple 24 hour timer, instant wifi access to something that needs a good hour to warm up seems a bit ott.

A good hour to warm up? Ah , wrong thread sorry.

 

[Taylortwocities]

I think I'd have talked her into a simple 24 hour timer, instant wifi access to something that needs a good hour to warm up seems a bit ott.

I agree, Shelly plus relay plus all your time is a hard way to do this.
Buy one of these. Job done

Timeguard Wi-Fi Controlled Fused Spur (Tuya Edition) - FSTWIFITU​

(other similar products are available)

 

[pc1966]

Related to this thread, I looked at there other products and this looks jolly useful:

Shelly Pro 4PM | Shelly Store UK | Smart Home Automation

Purchase Shelly Pro 4PM from the only Shelly authorised reseller in the UK. Shop Wi-Fi smart home automation now!

shellystore.co.uk

I think it can be used with wired networking and no need for "the cloud" so might be handy for small projects needing a degree of automation or power reporting. At £100 or so it is almost worth getting on just to play with!

 

[Dave OCD]

That looks like a very useful product ! Not keen on fused spurs on Immersions though with the full 13 amps being drawn for longish periods. 20 DP switches are better, fed from 16a OCPD.

 

[Lucien Nunes]

The WiFi relay is rated at 16A, but it will be designed for compactness and a 16A load would probably be pushing the actual relay within towards its limit. I would be interested to know how well they last when operating a 3kW immersion. Might be 100% fine and the electronics might be life expired long before the relay itself. But things burn out with immersion loads that in theory ought to survive, and many peoples' experience of this product will be switching trivial lighting loads etc. In a critical application I would probably go for belt and braces and use it to control a contactor or power relay.

 

[Avo Mk8]

I've had the Timeguard wifi switch operating the main (3kW) immersion in a holiday cottage for about 3 years now, and all good. The app is a bit clunky, but has a log of the past 24hrs showing when the load is active (not just the time it's set for - it indicates when current is being drawn), thus showing when the water has reached set temp, so can be reassuring!

WiFi Controlled 16A 7 Day Programmable Timeswitch | Timeguard (NTTWIFI)

 

[HappyHippyDad]

The relay worked as expected. A link was needed between L and L1.
Only problem was the neutral terminal screw didn't tighten up, so he is returning it. Still, glad I know how to do it now.
Thanks again for all the help.