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Thanks for looking into iSenseRF. I hadn't realised this about the Opentherm Protocol although it makes sense now that you've highlighted it. I was thinking of Opentherm as just a communication standard rather than as a complete standard for boiler control. I've changed the table. The...

I've read the Vaillant VRC430f manual again and I see it has option to allow the temp ramp up, but only if it's setup correctly. I guess anyone who had the setting below set to 'none' would suffer slow heating up times. " Switch-on room temp. (operating level for expert technicians) You...

I've read the instructions again and I can see that screen C8 allows the 'Switch-on room temp' parameter to be set to 'none', 'switch-on' or 'thermostat'. The 'switch-on' option seems to be one to go for as I assume it will ramp up the temperature when heating up the room from cold. The...

Have you got any examples of controllers that do this? It makes sense in any environment where the temperature is going to be allowed to fall by an appreciable amount, eg. night time

I want to try WC and I'm optimistic that it will work OK. I just want to be able to switch back to room temp control as well.

I've read enough comments on here to think that this might be the case. That's why I want to be able to switch back to control on room temperature if I need to. I don't mind paying a bit more to initially get all the options in place and then mess about with them to see what works. I suspect...

Does it also optimise the startup times, ie. earlier on cold days, etc. I've seen references to this in the literature, but it doesn't seem to be explicitly stated anywhere.

I don't think the wireless iSense is compatible with the boiler sold for the UK market. I'd like to think that it was, but when I spoke to Remeha they said it wasn't and that I wasn't the first to ask if a Dutch purchased iSense would work.

Why not just set it up with the temperature profile you want across the week and then leave it to get on with it. Is 26° your normal room temperature?

Having looked at the various options for boilers and controls I am keen to get the right controls as well as the right boiler. I’m looking for the option to have either control on room temperature or weather compensation. In both cases I want a control in the living room with a wireless...

You're not replacing like with like. I think you need to insert the Siemens control in series with the existing CH control. However to use the Siemens control properly would result in the HW being on 24/7. You also need a timer for the HW. The key issues is that the 1025E "is used with...

Can the VRC430 be setup to act as a simple programmable room thermostat, ie. not using the WC, but modulating the boiler to achieve a set room temp only? Would your system work better if you did this? I am thinking of buying a Vaillant 618, VCR430f and VR65, but I don't want the sort of...

I've used these two for a couple of years with an old Glowworm boiler and they provide very good control, They're both very flexible and the optimisation on the CM927 is really good. Surely though with a modern boiler you should go for a control that modulates the output? The CM 927 turns boiler...

Since you use the iSense you may know the answer to this question. Is there any difference between the wired and wireless versions, ie. do they both have the same functions? Also how effective is the weather compensation function?

Since it looks as if the boilers are considered roughly equal then the controls would be a deciding factor. One of the things that would help make the decision is knowing which one will give me a 7 day programmable, wireless, modulating thermostat with optimisation. I'm not so bothered with...

I think it's the Telford Tornado and Tempest that are the two different types from one manufacturer. I am probably going to go for a Santon, not least because the the warranty is better than the others. Fitting in the the expansion vessel is also no big deal in my case.

Given the choice between a ecoTEC plus 618 or an Avanta 18s is one much better than the other? Everything I read says that the Vaillant customer support is awful although the boilers are good. The Remeha approach seems more helpful with a lot of information on their website. The Remeha...

The pump won't ever draw air unless you run the cold water tank dry and start to empty the hot water tank. This might happen if the mains doesn't fill up the tank at the rate the pump is pumping at, but it would have to be a long shower. The concern you're grappling with is cavitation. You need...