HughF

OSB is more rigid, more uniform and holds up better if it gets wet. It’s a superior product.

Aircon guy is probably better value for money too. Used to dealing with a product that isn’t marked up because of the current grant of the week.

Yep, I use flap types for this task with the flap falling down under gravity.

Remember, the LG doesn’t have a dedicated buffer sensor, it just uses an internal temp sensor in the outdoor unit to sense flow. Same as the Samsung. On an LG there’s no way to separate the two sides of a buffer system from a call-for-heat perspective (unless you’ve done a terrible job installing it) - the 3rd party room thermostat wires back to the outdoor unit. They’re literally designed to have a room stat by default. Good heat pump, complex and can do lots of things. But a good unit. p.s. On the gen4 there isn’t a heater in the outdoor unit.

To be fair my system is very simple/small. 2 rads downstairs, three upstairs (usually off), three fan coils and a ufh loop.

My eahp has anodes (it’s a glass lined/enamelled steel thing)….. I should check the service schedule on them as I’m on acidic water (it eats non dzr resistant fittings)….

Ouch…. 60 degree rads - that’s burn your skin territory.

I run all mine wide open on the valves and the lock shields, weather comp takes care of everything. Stat is never satisfied and just calls for heat from September till April. dT of about 3 degrees, but I’m on a heat pump

Modulating pump in the boiler? If so just leave them all wide open and let the pump do its thing…. Throttling the rads down will just increase pumping resistance.

Rads sized for 45@-3, ufh runs at about 30. Ivar unimix3, no buffer, CCTs for separation. Peefectly happy with the system efficiency and performance, house runs 23.5-24 all winter. Size for 45 at target outdoor temp and go from there. Do be sure to ask your significant other if 21 is acceptable design temp, I didn’t 😂

I’ve installed 2x r290 mini splits with a third one about to go in. Dead easy (but I’ve watched a lot of YouTube)

I’ve got one running with no pipe extensions and one running with a extension kit. Running on the supplied charge, haven’t changed it. No issues with either of them.

I run a 9kW through a 1m2 coil - try it and see how you get on. if you do end up using the plate, you won’t get any thermosyphon effect through it. you’ll need to pump the dhw side.

Put it in the garden. It’ll reverberate something terrible on the flat roof.

Manufacturers guidelines are often wrong/poor design choices.