dpmiller

Yep, the Heatstream is just a TS. I was aiming for one prior to Harlequin pulling them off retail sale, and had our TS configured in a similar fashion. The Heatstream looks busy on top because it's got the mixing valve and a filling loop all up there. It's manual-fill-to-overflowing, with an air gap above, and a nifty wee float indicator for the level. Plus a possible 3rd coil for an additional heat source. Bear in mind, all you that poo-poo the lack of stored volume of the HS or other thermal store, that here in NI a small cylinder with a Willis is absolutely the norm and people are used to the concept of charging and re-charging a cylinder with heat. A 6-9kW HP can do much more than a 3kW Willis Copper Industries also approximated the idea in their Maxi-Pod tank

I wouldn't be surprised if tarmac was actually the dearer option, these days...

our aico smokes are on a relay box that I've configured to kill the MVHR (and bring on escape lights) on sensing smoke, whilst putting the system into boost in case of CO alarm. Yes, getting out is no1, but aving fabric and recovering is important too...

double post soz

It's a TS. 3m2 HP coil at the bottom, 3m2 DHW coil at the top. There's a fair degree of stratification, I've considered a destratification pump to increase the stored energy but have never encountered a situation where it was truly necessary. I also route the UFH flow through the coil so the tank is never cold and we have some buffer volume

A 9kW HP with a setpoint of 54c running into a smallish (250-is active) TS with a 3m2 coil, hasn't yet run out of hot water for us.

there are technologies in vehicles and in industry to deal with NOx

have they been rained on yet?

so who measured/ supplied/ installed the glass?

so do you have planning permission for the house in the drawings c/w a heat pump? If it was on the drawings them surely you have permission and must build in accordance with the drawings?

any bleach been spilled in the area?

one's pretty for your living room, one goes in the garage?

^ and all this stuff is configurable in the better stuff (or in some cases likely uses fuzzy logic to get ahead of the game a wee bit) eg with CoolEnergy an overshoot temp can be added to the PID control, so that it has more time to ramp down power and is likely to do a hard shutoff. Conceivably this reduces reliance on a buffer.

Why don't you say "tv antenna cable" is lesser quality @TonyT?

cheat the earth shutter and just shove the 2-pin straight in.

a fused spur outlet would be the job, if you can get one that matches

Very easy to change the max speed on the CoolEnergy units.

Is the settling period long enough? If the airlift is known good then it can only be taking liquor at the correct height/ depth. I'd say either it isn't settling for long enough or something is stopping it from settling. This could be biological perhaps

I'd say all the "cheaper" ones have simple contact-closure inputs and only need their own controller for flow setpoint etc. Heck some even have that controller on the outdoor unit. All @Beelbeebub needs to do is man up and order a containerload of his choice direct from the chinaman and presto! 30 cheap and easy heatpumps...

Say you've never worked with an oil boiler without saying it. Nozzles block. With particulates, with varnish (inside and outside), with... water. The orifice size you're talking about here is tiny- smaller than a human hair sized- and it doesn't take much. Only 7bar doesn't help... Manufacturers don't need to mandate replacement as the engineer should know both by visual inspection and combustion analyser readings what the jet's like. Most just opt for annual replacement as a tenner on a nozzle saves callbacks... Again hoses are a liability thing. Do you want to deal with the aftermath of 1000 litres of oil in your kitchen/ founds/ back garden? Any kinks or rusting to the braid, or UV damage to a rubber outer, and I'll change it. Moreso if the user is dabbling in WVO/ bio-D/ sump oil mixes as all are more harmful to the rubber.

can you not just put the U6 Pro or a cheapo wifi extender in the hallway that'll shoot through the front door to the doorbell and squeeze a wee bit of a signal through the wall for the camera? Any sockets on that outside wall, just inside the doorway?

The issue isn't manufacturing cost, it's price gouging en-route to the UK.

It won't. Not measurably.

@jon-leewho are you designing this for? Is it for yourself or a (paying) client?

Are you a business?