Canski Posted February 13 Posted February 13 Hi all, This is a only a temporary solution until my heat pump is completely installed. I'd like to install some way of controlling the timing of the immersion heater independent of the heat pump. I was thinking something similar to my Taco smart plug that I use to heat my garden office with a 2kw electric heater that is timed to come on and off as I need it and also using alexa. I realise that they need to be capable of 3 kw for the immersion but they are only rated to 2990 . What are my options or would they be ok ?
DamonHD Posted February 13 Posted February 13 I use my Eddi with remotely driven boosts from my RPi: the heat pump doesn't get a look in. (I also limit the grid demand while boosting to 2kW.) I appreciate that this may not be at all what you are after of course!) All this to do smarter and less frequent pasteurisation, basically only when the grid is relatively green.
JohnMo Posted February 13 Posted February 13 1 hour ago, Canski said: controlling the timing of the immersion heater Just get a basic immersion timer then, Screwfix, Toolstation etc all sell them 1
SteamyTea Posted February 13 Posted February 13 I just use a basic digital timer. Been in over 15 years now, no issues. It is a Selectric Energy Saver Model Number LG-DIHT https://www.amazon.co.uk/DIGITAL-IMMERSION-HEATER-TIMER-LG-DIHT/dp/B0066NEBO6
TerryE Posted February 13 Posted February 13 You shouldn't use a typical smart plug. Some might be nominally rated at 3kW at 240VAC they can rapidly heat up especially when powered up for a few hours. I control my 3×immersions (2 in the UVC and one in a Willis heating my UFH) by decent din-mounted contactors in the MCU. These are rated at 20A at 240VAC for a straight resistive load. These have a design life of 50,000 cycles. Their coils are driven at 24 VDC (at 10s mA) by an IoT relay board controlled by my HomeAssistant system. I've done posts on this if you want know more. My TL;DR is that it can be done but you need to know what you are doing to avoid the fire risks. 1
SteamyTea Posted February 13 Posted February 13 (edited) 12 minutes ago, TerryE said: Some might be nominally rated at 3kW at 240VAC they can rapidly heat up especially when powered up for a few hours The first timer I bought, cheap on eBay, did not last long. It did fail safe though. I spent an hour in B&Q looking at them, then bought the above cheaper online. Edited February 13 by SteamyTea 1
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