opentherm

I've recently had a new Ideal boiler installed (Ideal Logic Max Heat 2 H18) and plumbed for PDHW (priority hot water). I use it with EPH CP4 series: CP4i, additional Combipack 4, CP4-HW-OT, wired and configured as per EPH instructions, covering downstairs, upstairs and hot water tank, with the...

Hi All, I am curious to hear if anyone knows if the Vaillant VR33 Module that can be used to convert Vaillant Boilers to support OpenTherm also works together with the Vaillant AroTherm ASHP range? As far as I can understand Vaillant uses a very old protocol (eBus) for communications between...

So here is the current situation. The Tado thermostat is currently connected to the Baxi Assure 36 Combi Boiler using Relay as you can see from the pic below. The Brown wire is in the NO terminal and the Black wire is in the COM terminal in Tado smart thermostat. There is no need for a Live and...

Hi. I'm new here. I've purchased Google Nest 3rd Generation learning thermostat and engineer came yesterday to install it. Live + neutral from Heatlink connected to boilers live & neutral, then OT1 and OT2 connected to the block on top of the electric board (pin 3 & 4) (see image- not mine, but...

Hello, I spent some time reading threads on forums to figure out how my heating system should be wired. I need guidance from those more knowledgable than I. My current set up consist Intergas Xtreme 36 boiler with two Opentherm inputs. Nest 3rd gen connected to one Opentherm input to control...

I’m in the process of acquiring a new boiler due to the conversion of my loft and the installation of a mechanical ventilation and heat recovery system. I’ve recently discovered that Google Nest is unable to handle multi-zone systems and reverts to a simple on/off thermostat. My preference would...

Hi, I've been having a look around here at various forum posts which have been useful, but I can't find the exact information I need. So I decided it was time to sign up and get involved. I'm hoping someone might be able to help. I have a Baxi Duo-tec 2 Combi 28 GA boiler and a Tado v3 wired...

Hi All, I'm trying to fit drayton wiser thermostat to connect to opentherm on alpha evoke 33. The existing boiler is fitted with the basic alpha wireless thermostat. I wired the new thermostat to the opentherm to the 41 and 44 and switched the P7 to 1 as described in the documentation. The...

Last year I had a new combi boiler installed alongside the Drayton Wiser smart hub system. This is the boiler: Ideal Logic Combi Boiler This is the controller system: Drayton Wiser Kit 1 I didn't know at the the time that the installer could wire it NOT using the OpenTherm module. I want to...

My heating engineer is going to install a new combi boiler for me (Ideal Logic 2 Max), which I think he will fit with a standard thermostat / control. This boiler seems to support OpenTherm, and I'm wondering about fitting a smart thermostat and radiator valves at a later date to improve...

Hello All My first post here in hope you guys can help. Got my first house and upgraded the boiler to an IDEAL VOGUE MAX S18 - it is a system boiler as I have a water tank in house 16yrs old. I thought being clever and looked into Opentherm due to effeminacy etc and got myself TADO smart...

Hi all, I've searched online and can't find anyone with the same issue, so thought I'd post here. At the weekend I installed a Nest Thermostat E to my Baxi 228 using OpenTherm, replacing an on/off thermostat. Initially, I removed the old thermostat's wire from terminal X4 and did not reinstate...

Hi, I've joined because I have a lot of trouble with trying to make my new boiler work with the Opentherm interface and thought someone with more experience than me could help. Equipment: Drayton Wiser - Single Channel Programmer with Opentherm module. Baxi 836 Combi boiler with Opentherm...

I'm about to get a Viessmann 100-W B1KF and plan to have it hooked up to a Tado smart thermostat system. I'm assuming that as the Tado supports OpenTherm, to get that benefit, I should ask the installers to make sure it is in the operation mode highlighted below (from the 4 available)? I've...

Hi All I have had a search through previous posts and google, but everything I find seems to get me more confused. I have just had a new Vaillant boiler fitted, an ecoTEC plus 838 combi. It is just the boiler at present, operated by the controls on the front only. My plumber is offering to...

Adding a gas boiler to my baroque heating system (thermal store, woodburner, plate hex for dhw) and looking at control options. The system is plumbed so that the woodburner always heats the thermal store. There are manual valves to allow the gas boiler to heat the store only (rads then run from...

Sorry this is so long! Situation: I'm often away from home for a week or more, and want to be able to switch the heating on before I return - but I don't want to go the full Nest/Hive etc or rely on a third-party service. My last place had a combi gas boiler which fired on demand, if either...

Just thinking ahead to my next boiler, which will probably be a Baxi 800. On a Baxi to use OpenTherm using a Baxi uSense smart controller, the controller has to be hard wired to the boiler, which is no good for me. Looking at the Nest, it appears the hard wiring only goes to the Nest Heat Link...

First post for me and chose to ask here as you seem to be a helpful bunch of people with queries like mine. Here's the state of play... 1. CH and HW was controlled with a timer. S Plan with HW tank. 2. I installed the Nest based on several days of research, tracing wiring and input from...

I have an Intergas Eco RF 36 with a T4R and weather compensation. I'm looking for my installer to change the current wiring over to OT. Having read a lot today, I'm confused as there lots of conflicting opinions as to whether WC and OT can work together without problems, but not what the...