Any way to bypass the water cyclinder in a vented system?

monseiur

Assuming the house is occupied (not a holiday home) and a certain amount of domestic hot water is required daily, is there much of a saving to be made by not heating the water in the cylinder. Once heated and with a good lagging jacket it should cost very little extra to keep heated to the same temperature as rads.

John.G

https://www.boards.ie/discussion/comment/119256217#Comment_119256217

If the HW is gravity fed boiler may have 4 pipes, a flow & return on left side and same on the right. You ideally need a fully pumped system with another motorized valve for HW control.

Deanicus

I have tado on a 2 zone system, 2xCH and 1XHW, so it is possible

I vaguely remember when wiring it up, I had to use a jumper wire between the HW terminal and the live one, in order to get it working correctly.

Having said that, at the time I was on and off with support trying different things as it wasn't working correctly so my memory could be flawed. Might be worth getting onto Tado support as you can email them your pics with a description of your system and they might figure out the issue if it is not how your system is configured

Check the last post here where I describe it a little better: https://www.boards.ie/discussion/2057524795/3-channel-to-2-channel-controller/p2

wiz569

It won't work with only one 2-way valve regardless of how it's wired tbh.

Deanicus

https://www.boards.ie/discussion/comment/119261203#Comment_119261203

Absolutely. Thought there might still be doubt on the system configuration so if it is supposed to be separate I'm suggesting the wiring in the tado extension kit might need to be changed

Galego

Hi all,

I think i have managed to figure out the system.

1- L linked to 4 -> does not fire boiler, makes M.Valve move.

2- L linked to 3 -> fires boiler and again, boiler heats the water in the cylinder. Not radiators.

3- L linked to 3 and 4 -> fires boiler and heats water in the radiator, and HW cylinder as well. Moves the M.Valve.

In summary. Tado wired in Gravity mode, HW terminal 3 goes live for either HW or CH timed events. Terminal 4 only goes live for CH only, and this is used only to open the valve to the rads.

Furze99

https://www.boards.ie/discussion/comment/119256480#Comment_119256480

That's what I'd be thinking too.