foundationsmcr

Our boiler is a Baxi Duotec Tec 2 - 33 GA model Max heat output is 33KW DHW and 29.6KW CH (Condensing) I think the Min/Max is 5.1 / 29.6 CH flow rate temp 25-80 degrees (+-5 degrees) I'm not sure if I'm reading the correct element of the manual. I've snipped some tech details and attached them. Will this require a volumizer? As mentioned, we will still be running Rads upstairs. I'm reading some conflicting into on single or multi zones. We have young kids and doors are open/closing constantly, so would it therefore be better to have one single zone? If attaching pipe to the concrete, how do you prevent the screed leaking out with no DPM type barrier down to contain it? Thank you all, this is a steep learning curve!

Thanks again both. Our floor covering will be LVT throughout so all the same. Nick, ref clipping to the slab, is the primer used to bond the screed to the slab or this clip rails you refer to, or the pipe? I'm a little confused. Please explain the reference to the boiler modulating and the volumizer.

Sorry, I should add, the 12mm is probably driven by the fact we are trying to minimise build up due to laying this on existing floor.

Hi John, thanks for the swift response. Just help me understand that a little more. Single zone I get, so no room sensors or differentials. No actuators or wiring centre? What does this do? We're not planning to change upstairs rads so does that mean we'll need the mixer, so what's an "Ivor" mixer specifically? Slab fully engaged instead of insulated panels. I thought the Option A system would be a plastic tray like the attached image, is this the same as "egg crate style"? 16mm pipe, will our boiler support this flow temp and rate? Last question, would there be any benefit in connecting the system to our current Nest smart thermostat? Thanks again, this forum is a font of knowledge and fantastic support network.

Option 2 1x 8port manifold along mixing kit and additional ufh mod. FASTWARM pump (Wilo/Grundfos pump, Emmeti/Giacomini Stainless Steel Manifold),  Supply and fit visqueen (dpm) along relative primer, adhesive(where required)  Run Pipework on ufh System (12mm diam, spaced 150-100mm pipe centre) Supply and fit 2x HoneyWell (or similar) S-Plan Zone Valves,  Run 22mm copper feeds between manifold and boiler. Hive mini thermostat Tarmac Gypsum based liquid screed 25mm Please share honest views on these systems!

Ok so I have some quotes now and would really value some insight/honest views of the various options. I'm likely to go for an overlay system clipped into matts with Screed poured over, as I understand there is sufficient insulation in our existing floor given that I'm trying to avoid a significant build up. Here are the specs I've been looking at with various contractors Option A Area: 90sq m Depth: 30mm Compressive Strength: up to 25 N/mm Membrane 500 gauge System Type: Tackernail Pipework:16mm PERT Pipe Spacings:150 mm Manifold Type:Warmin Mixing Manifold with Circulation Pump Manifold Size:8 Ports Heating Controls:4no. x Heatmiser NeoStat 230v Wired Thermostat 1no. x Heatmiser UH8 Wiring Centre Warmin LowPro 25 UFH Panels • Low height panel of just 20mm • Allows 25mm Flowing Screed on Solid Floors* • Allows 35mm Flowing Screed on Floating Floors* • Tested and certified using Thermio+ Flowing Screed Multi-zone Underfloor Heating System (Wired Control) • Warmin 16mm x 2mm PERT Pipework • Warmin Stainless Steel Manifold with flow meters, flow and return temperature gauges, water pressure gauge and auto air vent • Warmin Mixing Valve Unit with Grundfos UPM3 Circulation Pump • Warmin 230v Actuators • Heatmiser NeoStat 230v Wired Thermostats • Heatmiser UH8 Wiring Centre

Thanks for sharing. What was the overall build up from the original floor if you don't mind me asking.

Thanks for your help. I assume we have 100mm PIR within the floor build up, I'm trying to locate the original plans that came with the house when we bought it. As I've said, it was built to Building Regs in 2013 so is there not a standard for that time? We'd just prefer not to have rads as it restricts where we can place furniture. We also like the concept of a warmer feeling underfoot. Baxi Duotec 2 Combi Upstairs yes, but we're planning to remove them all downstairs.

Hi, for context I'm extending a property that was built in 2013 to current building regs. I'd like to install a wet UFH system running off our existing Combi boiler, and have ruled out digging down (cost and disruption - we have a small young family to consider!). Obviously I'd like to minimise the threshold increase in terms of floor build up as best I can. We are planning to finish the downstairs with LVT flooring. I'm lost with all the various options and suppliers, but need an estimate to build into our remortgage costs. How do I go about narrowing down the spec and cost quickly? What info do I need and how do I find it out to help secure an estimate. I understand our flooring is a concrete base, but I'm no builder and don't know where to start with this. Can anyone help? Many thanks