Worcester Greenstar 24i Junior and Hive 2 Heating + Hot Water Installation

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Dan the Ram

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Hi all,

I have a Worcester Greenstar 24i Junior combi boiler and I want to fit a Hive 2 heating and hot water thermostat.

I realise that I've bought the wrong version but I'd rather make do with what I have instead of having to send it back to get the heating only version.

I believe this is possible, how simple is it? I know my boiler runs 230v which I think is important, is there any other reason why it wouldn't work or is there anything to be aware of?

Thanks,
Dan
 
Pretty sure from previous discussions on here that this can't be done. Hive is the least energy-saving of all the connected thermostats so you could take the opportunity to send it back and get something much better like a Honeywell T6 instead. The T6 is often a bit cheaper too, so you save on both purchase and running costs
 
Thanks for the response!

Out of interest what are the reasons why this can't be done?
 
As far as I am aware for room temperature control you have to use Wave, seems Bosch Worcester has not enabled their boilers to use third party thermostats. However to stop the boiler cycling you could use nearly any thermostat, the cheaper the better as you don't want anti hysteresis software, the anti hysteresis software starts to cycle the boiler on/off as it gets near to set temperature, every time boiler switches off heat is wasted out of flue, so you don't want it to switch on/off you want it to modulate instead, which with Bosch Worcester means use eTRV heads not a wall thermostat to control room temperature.

But boilers have to circulate water to know if required, unless a thermostat or similar is fitted, so in a room kept cool, with no outside door, and no alternative form of heating, we fit a simple thermostat to turn system off in warm weather, I suppose thermostat could be outside, but not in a warm room normally used for living in as in general we want that room too warm, so on a prospective warm day we will pre-heat rooms so latter they over heat.

So basic on/off thermostat is used to reduce cycling, modulating thermostat is used to control room temperature, Hive is a on/off thermostat.
 
ericmark said:
As far as I am aware for room temperature control you have to use Wave, seems Bosch Worcester has not enabled their boilers to use third party thermostats. However to stop the boiler cycling you could use nearly any thermostat, the cheaper the better as you don't want anti hysteresis software, the anti hysteresis software starts to cycle the boiler on/off as it gets near to set temperature, every time boiler switches off heat is wasted out of flue, so you don't want it to switch on/off you want it to modulate instead, which with Bosch Worcester means use eTRV heads not a wall thermostat to control room temperature.

But boilers have to circulate water to know if required, unless a thermostat or similar is fitted, so in a room kept cool, with no outside door, and no alternative form of heating, we fit a simple thermostat to turn system off in warm weather, I suppose thermostat could be outside, but not in a warm room normally used for living in as in general we want that room too warm, so on a prospective warm day we will pre-heat rooms so latter they over heat.

So basic on/off thermostat is used to reduce cycling, modulating thermostat is used to control room temperature, Hive is a on/off thermostat.
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Forgive me if I'm misunderstanding but I've seen other posts of people installing Hive with Worcester Bosch boilers so I definitely think they should work,, unless I'm misunderstanding you?

I want to know if there's any reason why I wouldn't be able to install a dual channel hive on my Worcester combi.
 
I see that there are a group of Worcester boilers that cannot have Hive installed but I've checked the GC number and mine isn't one of them
 
Dan the Ram said:
Forgive me if I'm misunderstanding but I've seen other posts of people installing Hive with Worcester Bosch boilers so I definitely think they should work,, unless I'm misunderstanding you?

I want to know if there's any reason why I wouldn't be able to install a dual channel hive on my Worcester combi.
Click to expand...
There is a difference between will work, and will work efficiently, I had a house with gas fired hot air central heating, because the air goes around in a circle with vents in all internal doors, a single thermostat will control the whole house, it was not a condensating boiler so it had a fixed flame size, so a Hive thermostat would work very well, in other words very like central heating in USA although the house was in north Wales.

So will it work? Yes, will it work efficiently? no.

Most people fit thermostats with connections to their phone to save on running costs, be it fully automated with geofencing or requiring you to manually alter the temperature. Idea is not to heat house when not at home so saving money, if when heating the home however it repeatedly turns boiler off/on then what you gain on swings you will lose on the roundabouts. However it will work, just not very well.
 
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