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Did as you said - opened all valves a couple of turns until the hissing stopped, rebalanced - and everything is much better. Each radiator gives 7C drop and boiler has stopped short-cycling. I'm gluing those caps back on the LS and not touching it again!! Cheers for your help.

Cheers, guys. Lol, you're absolutely right. If I hadn't have touched it, I wouldn't be having such problems. If it ain't broke...... Anyway, was trying to achieve a 12C drop as stated in the guides, but I'm guessing that is all down to the radiator manufacturers, since I could only get a...

Boiler is Vokera Compact 29A I decided to check whether my system had been properly balanced, as the guys who fitted the boiler had already done it, but without the use of thermometers. The system is small and all quite compact, so there's actually not that much difference in flow between...

Ok, will give that a try. Yes system was re-balanced when boiler was fitted last week, as the installers asked me to run some X800 in the week before, with all valves and LS fully open. Thanks for all your help!

You could be right, yes. Do you mean close down the normal valve or the lockshield?

Radiators are type K1 (single panel with fins) size 1200x600 and 600x600, giving 1200W and 600W respectively. Stove is excellent in the winter, as you say. I've positioned the thermostat such that it is not affected by the heat from the stove. The stat sits in the hallway and I make sure the...

Well, I'm an idiot. Made some assumptions here - and you know what they say about assumptions... Anyway, after checking the size and type of the rads PROPERLY, the outputs are 1200W and 800W. Therefore, the correct calculation is as follows: (1200x4)+(800x3) = 7200W plus a towel rail of...

I'm pretty sure I've chosen the right rad sizes from the catalogue, but I can double check. They are definitely the ones without the fins on the back. Unfortunately, they were brand new when we moved in, so I was loathed to replace them. I calculated the heating requirement based on the...

Lol, sorry. (571x4)+(286x3) = 3142W Plus a towel rail, so say 3.6kW. Hmm, kinda low right?

Haha, no problem. Thanks for the very entertaining thread! I'm actually at work at the moment, so it's a great way to pass the time :lol:

Just done the boiler size calculator. According to this my heating requirement is 12.86kW. My radiator outputs are 571W (1200x450) and 286W (600x450). Not sure what the towel rail would be. So, would you say another 15kW for DHW, hence the boiler is probably a bit oversized.

Checking the manual, this boiler does support SARA. The boiler is currently set within the SARA range. So, could this mean that my efforts to regulate the return to below 55C are futile, since when it is calling for heat for a sustained period, it would crank the burners up anyway? I'm...

I've just been adjusting the flow temperature at the boiler, whilst everything else was at full demand (i.e TRVs and room stat.) Had a look at the instructions and the only thing I can find is "Maximum Temperature Differential" which quotes 35C, which I don't think is what we're looking for...

My old combi used to have a pump speed adjustment. Checked the pump on the Vokera though and you're right, there's no adjustment. I've had a bit of a tweak this evening and I've managed to get the flow to 68 and return to 55. That's wilth all the TRVs on full. The rads are only single...

Thanks for your reply. The guys re-balanced the system when they fitted the TRVs, as they opened all the lockshields when the system was flushed a week before install of the boiler. The system is only small and didn't need much balancing. I balanced it myself a while back and most of the...

I've just had a whole new boiler system and controls fitted, consisting of the following: Vokera Compact 29A combi condensing boiler Honeywell CM927 room stat. TRVs on most rads The boiler has the normal flow temperature controls on the front for setting the main boiler running temperature...

I wouldn't read into the 'mates' bit too much. As I said in my original post, he's a friend of a friend, so I wouldn't regard him as my mate. He was simply recommended to me, so there's no need to get ancy about me trying to rip people off. I simply asked whether or not the price quoted to me...

Thanks for the replies. He's happy to fit any boiler for me, I just asked him to keep price to a minimum as I'm struggling a bit at the moment and this is what he suggested. If the Vokera's are troublesome, I can ask him to see what else he can pick up at a reasonable price. He describes...

I need to replace my current boiler and a friend of a friend has given me what I think is a reasonable quote, but I'd like to see what you guys think, having much more experience than me. I've asked for a reasonable budget combi-boiler to be fitted and this is what he quotes for: Vokera...

Yeah, think I will see what BG can do for me. Unless, anyone is feeling brave? :wink: