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Sorry, didn't answer the question - a CM67Z can only handle two zones, and you can only have four CM67Zs bound to a boiler controller, which does limit you to eight zones with this system. The Hometronic system does have quite a few features that the CM-Zone doesn't have, but at quite an...

Just for interest (well, at least mine anyway) BG have been back as the boiler was still overheating. They recognise that it's kettling constantly but don't agree with my local plumber that the pumps on it's way out. I've rebalanced the system sacrificing the dining room and kitchen and the...

I have a seven zone CM-Zone system running using four CM67Z controllers. All four of the CM67Z units are using the internal termostat to control the radiator valves (HR80UK) in the room they are in, or in the case of the kitchen it is controlling two HC60NG zone controllers (one for a two...

For one reason or another we now have a 3.3m x 3.6m flat roof on the extension which has no ceiling, no insulation etc. You look up and you can see the rafters and the decking. We had a major leak and large part of the ceiling colapsed during the redeck and reroof, so I just finished the job...

Well, BG have been and replaced the PCB and it fired up ok yesterday evening and this morning without cutting out. I'll give it a few more days to settle in before thinking that they may have fixed it. It worked for about a month ok last time they "fixed" it. They may be back before then...

The new Grundfos pumps with permanent magnets etc are getting there, but pumps aimed at marine aquarium are very good on the joules (watt second) per litre pumped ratio, the older grundfos pumps are not as good. Marine pumps are not cheap though in comparison to circulators like the 15-50, but...

ah, sorry, I keep dropping comments in which I really shouldn't do. You can get a conversion kit for the Grundfos 15-50 and 15-60 which replaces the impeller housing and the impeller with a marine safe version, so just using the motor drive from the Grundfos and not any of the wet bits...

[as an aside] Do you think that the four feet or so between the vent pipe and the F&E pipe is helping matters? Everything I've seen says 6" max. Don't know what the implications of this are. [now back on track] I currently have a Grundfos 15-50 on III servicing the indirect coil of the...

Thank you all for your replies, this thread does appear to have got confusing, I pity anybody trying to read through it now! The heat bank idea is now on hold, maybe for a long time. I still think it would work very well and that a CH buffer tank would give me a lot of benefit coupled with...

Yep, in this case I was trying to push the full power of the pump through into the areas of the central heating that are not performing very well. Flow through the bypass only stopped (well, sounded like it had stopped) when it was almost totally closed. Where it is normally set (by the...

Sorry, lots of posts but just trying to explain as best I can where I am in case something which I left off so far triggers something... I think that the issue is the proportional nature of the demand, it appears to demand a proportion of heat if it only needs a bit so it tries to keep the...

I have Honeywell TRV bodies with HR80UK motor units all round apart from the kitchen which has a 2 port valve controlled by a CM67Z and a HC60NG bound to zone one with the CM67Z using it's internal thermister for control of the HC60NG. Because in effect every radiator is a zone in itself I...

OK, the situation is this, I appear to be caught up in some internal politics on this site with some DD making up posts to justify heat banks. Never mind. A little more about the system then. The house is a bungalow with a loft conversion, no heating in the loft conversion rooms as so far...

The buffer zone you have will be helping a lot, that's the kind of effect I'm looking to put into place. Had I a bit more room I would be thinking of a small buffer tank for the heating system only, but not having that room the heat bank is the next step. For all of the not so good things...

You did, thank you. It just sounded a little vague and I wasn't sure if that was lack of knowedge coming through or just style. Sorry, should have done a better background check before doubting you. My bad. Do you have multiple CM67Z units on it? I currently have 7 zones using four CM67Z...

Based on my experience as an end user having to live with a CM-Zone system..... The problem with the HC60NG (which I have two off, one as a zone control for the plinth heater and one for the boiler control) is that they do what they are told. They cycle on 12/6/3 cycles per hour so either...

Bit of background: I have a standard Worcester 19/24cbi boiler pumped to nine radiators and a kitchen plinth heater. All radiators have TRV bodies with Honeywell CM-Zone HR80UK controllers and the plinth heater has a two port valve on it for flow control. As everything could be shut there...

I am going to replace my standard DHW cylinder with a DPS GXV mainly as a buffer tank for the central heating as I have a non-modulating boiler with Honeywell CM-Zone gear on all radiators (with automatic bypass to keep boiler flow going) and it's just not working well at the moment. I was...