Recent content by Tul

OK, I'm looking at using a buffer anyway. One supplier is recommending 20l per kwh as it's a pellet boiler that modulates, and any size buffer (as big as I can fit) should help get the circuits working properly.

Just had an idea and want to float it. My original post was because my rads didn't heat up when the UFH circuit was on. What if I use a 3 port valve at the flow to the rad circuit, then use the return from the rad circuit to the flow on UFH circuit. The valve will allow the UFH circuit to...

I'm now going to ask someone to stick their neck out and recommend a product / manufacturer, contentious I know but better than me taking a stab in the dark.

Thanks. Would you say running the boiler indirectly through a coil is a better idea than direct. I like the coil idea because the boiler circuit is then really simple and should not be as susceptible to leaks so I can keep the circuit well protected with inhibitors. The pellet boiler is very...

OK thanks. I have been looking at thermal stores etc and am pretty confused! I already have an unvented DHW cylinder (Gledhill torrent) I presume I don't have to get rid of this? the buffer tank is just an empty cylinder with tappings, the hot water from the boiler goes into this the I have a...

How do you work out what size thermal store you need. Although the store is vented I believe you can still heat an unvented or vented DHW cylinder from it as well as the CH, is that correct?

I think the ESBY valve is about 54deg (does that sound right) and the MI does allow for direct use. The UFH and Rad design is really good and I have used it before to really good effect which is why I installed it this time. I relied on the installer for the pellet system but I think this is...

Would this be causing no circulation in the Rad circuit? I would think an undersized boiler would just mean stuff not getting as hot. I checked the manual and it says useful output to water 10.8 kw so it seems very undersized from what you say. I'll speak to the installer, he did the calcs...

The UFH section (downstairs) is ~100 m2 and the rads (upstairs- bedrooms) is 64 m2. Insulation levels are high Sap cat B. To be honest with the UFH working you hardly need heat upstairs! but I do want the system to work together fully. The rads do heat up when the UFH shuts down.

My Sap certificate (its a new build) says 8542 kwh/yr space and 2426 kwh/yr water. Can you work out the boiler size needed from that?

It's an Extraflame Duchessa Boiler/stove declared output of 12 kw

I have an underfloor heating system downstairs and a radiator system upstairs, the radiators all run from a central manifold. The heat input is from a pellet boiler with internal pump, the UF circuit has it's own additional pump. When the underfloor heating system is on I cannot get heat to go...

Thanks for that. It's a while since my post and since then the house is complete. I ended up using insulated plasterboard dot and dabbed to the aircretes. I tend to use plasterboard fixings for most things. The method of an undersized drill hole and standard rawlplug works as well as...

Thanks for that, I used woodscrews myself for the wall plate ties. I haven't tried standard frame fixings so I'll give that a go. Too late for the expamet I'm afraid for the cracking, but wondering if I should run repairs like stitching in cracked brick or might I just create another crack...

Aircrete blocks!! I am building a new build and finding it a bugger to make decent fixings, so far I have found 3" wood screws are my best bet screwing into a small pilot hole. I am thinking of using injected resin for stronger points or using a wood plate with several screws and then fixing...