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Thanks ScottishGasMan - I wonder if the bypass might need adjusting then. Take your point about reducing flow, but surely if some elements are still calling for heat there is still somewhere for the heated water to ‘go’ as it were, therefore flow is still maintained? Particularly if system is...

Hi there, I've got an Ecotech 630 heating a 3 zone UFH system, 7 radiators (TRV's on all bar the towel rail) and 250L unvented hot water cylinder. All controlled by a VRC700 with weather compensation. I realise it's probably an oversized boiler for the set up (a previous plumbers choice, not...

There is a torn old label on the cylinder which says 'Copper to BS2870' on it. There is an appreciable difference in temp on the flow and return when the HW heating cycle first starts but after around 10 mins they are fairly close. I've managed to get a bit more of a temp drop by closing the...

The pipes are mostly hidden behind fitted wardrobes and under floors I'm not planning to re-carpet any time soon... The HW tank was completely emptied this morning so I thought I'd check it's progress on heating up again this afternoon. After 105 mins of the boiler on at 70c flow temp, the...

The tank flow and return pipes are hot, yes - 62 ish degrees which I figure is fine due to losses through pipework travelling up 3 storeys. The water is hot and plentiful, I just figured that the boiler might do the job quicker. But if as you and others say it's an old coil, then perhaps it...

I'll try increasing the temp to 75c and see what happens There are 3 'old rads' as I think of them (heavy, no radiating fins) which I have thought of replacing as it shouldn't cost much... Rest have fins and do get that bit hotter. I'll think about the CM907 option. When the weather is...

JohnD: 3-port behind panels and I can't check at the mo, will check later and report back. No, HW only also runs for 60 mins in the morning for showers etc Don't know, we've been here 2 years and it was here when we moved in... d.19 currently set to 2. Should I try something...

Hi, me again, So attached to my Ecotec plus 630 boiler are 11 rads and a hot water cylinder. I was having a problem with the HW cycle taking all the heat when there was demand for CH & HW so the HW has a separate time period now. Thing is, the HW heating period is 90 mins in the afternoon...

Well, after a couple of weeks mucking about, I'm none the wiser. The boiler seems to get the heating job done quickest when running at full power of 30kW and doesn't seem to cycle too much. I set the pump overrun time to around 12 mins so that in the 'down cycle' time of the the thermostat the...

Gotcha, cheers

Thanks Dan - on the KW's question, I'd have thought a 30kW boiler would be able to adequately heat both circuits at the same time, wouldn't you? It's 11 rads + HW cylinder...

Cheers D_ Pardon my ignorance but what is a gate valve? Just a regular valve? There is a largish round red-handled valve near the cylinder which I *think* is on the return pipe - might that be it? To balance it, would it be similar to rads? What sort of temperature drop should I aim for...

Thanks for quick reply Dan. Pretty sure it's 22mm but the panels are all back over the piping now so can't check 100%... I've set the partial load on the boiler to 18kW as others have advised it's a tad on the large side, will that help? Anything else you'd recommend?

Hi there, I have a Y-plan setup (Ecotec plus 630 boiler, Honeywell timer, roomstat and cylinder stat) heating rads and a hot water cylinder. I'm 99% certain the valve is wired up correctly and switching properly, but when there is demand for CH and HW, the rads all drop in temperature quite...

Will give it a go and post results in a few days, cheers.

Cheers for the quick reply ScottishGasMan. It's an older vented cylinder which seems to do the job OK - got the thermostat on that set to 60c. Just as I thought re. ebus. Reading up on it I think I'd also need to get a Vaillant timer/controller too? You mention a smaller system boiler - if...