Using two 2 channel Hive receivers in one system to control immersion heater

[Brian McHugh]

Is there any way to use two 2-channel Hive receivers in the same system using the Hot Water circuit on the second receiver to control an immersion heater via a 40A relay?

 

[polesapart]

Must it be Hive?

I'm sure there are cheaper internet-enabled switches to operate your relay.

 

[ericmark]

A motorised valve is a relay, so yes, the relay replaced the motorised valve, but why?

 

[CountryFan]

A motorised valve is a relay, so yes, the relay replaced the motorised valve, but why?

You do realise the question is about an immersion heater?

 

[ericmark]

You do realise the question is about an immersion heater?

This is why I said "but why" I think it is far easier to fit a timer direct to the immersion heater. Water takes time to heat and cool, so there is no need for internet control, the timed control is just to line up with off-peak supply, there is a method using two elements often a switch on the immersion bath/sink and the external immersion Willis system so we can heat varying amounts of hot water, but can't see how this could be used with Hive?

 

[denso13]

I think it is far easier to fit a timer direct to the immersion heater.

He wants to use the Hive as the timer, which seems to be possible.

 

[ericmark]

He wants to use the Hive as the timer, which seems to be possible.

Yes, that is what I said, but price of single channel Wiser v double channel Wiser, was more than a timer would cost, not sure with Hive, I made a mistake, it sounded good when I got it, I go iboost+ so I can use spare solar, but solar paid at 12p/kWh and off-peak is 6.5p/kWh, so a simple timer would have saved me more money. So it only paid back for 20 months while getting the MPAN number sorted out.

The price of Hive seems to vary a lot, latter versions can do opentherm, and with a gas boiler that does seem a good idea, but although Wiser has the opentherm on single, double, and three channel versions, I note the instructions only advises its use with single channel.

I don't have opentherm, I do not even have a modulating boiler, so it does not concern me, when an oil boiler tends to last so long, so unlikely to need a replacement.

But a gas or oil boiler has a start-up and shut down time, whereas my immersion heater can run for a matter of seconds, and use between around 200 watt to 3 kW, and uses solid state control so it does not matter if it runs for one second, it is not wearing out contacts, cooling down or heating uptime is not a problem. I see the consumption following solar production as the solid state control varies what the immersion uses.

But both Wiser and Nest which I have fitted, have options for gas or oil, due to the changes in how often we want them to fire up, gas reacts faster than oil, think there is an electric option as well, so to use two different fuel types with the same controller would not be the best idea.

But it would work, but I repeat why would you want to?

 

[denso13]

But it would work, but I repeat why would you want to?

You are the biggest proponent of smart homes and odd set ups yet when someone asks a relatively innocent question you ask why? Just a bit odd...