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Wired up as per last post with two common bridges to live and the HW plus CH wires labelled up and fitted to their respective NO terminals; and it is functioning. The only thing I have noted is that the boiler cycles on and off more often than it did with the Randall controller. The cycling...

The Tado pack arrived today so I have taken the casing off the Randall unit. Not entirely what I was expecting. All of the three cables are three core. Position 1 - Empty Position 2 - Pump live feed (HTG position) Position 3 - Empty Position 4 - Boiler live feed (DHW position) Position 5 -...

I installed solar this Summer so we now heat the water using the 3kw immersion except on thick cloud low solar days when the oil boiler uses only 300w. I worked out that by heating the water with solar I will save around £400 a year in lower heating oil consumption with the boiler running less...

I had a look at the pump, it's a Grundfos UPS 15-60 130 with an amperage spec of 0.22A to 0.30A depending on speed setting.

I've found a suggested gravity wiring recommendation on the Tado community forum that looks OK to my untrained eye. Randall HTG to CH NO Randall DHW to HW NO Bridge Live to CH COM Bridge CH Com to HW COM Combine all neutrals on N Mains feed to L Pump live to CH NO Combine all earth on Earth...

Thanks for the input. The Tado manual says the blue LED activates both relays (for CH and HW) whereas the yellow setting omits the HW relay. Leaves me wondering what the difference is between the Green and Blue configurations, presumably this has to be the wiring configuration for the pump...

There are a few threads on this kind of swap out but not around my specific circumstance of a gravity fed boiler with no tied thermostat. I have the old style gravity fed hot water system with pumped central heating off a 2023 fitted non condensing Mistral oil boiler. I want to change out the...