Nickfromwales

Back up is one thing, so that was not aimed at you, it’s for those who have underestimated the ‘need’ for heat and how to best deliver it, both comfortably and conveniently. Having to employ auxiliary heating should be the exception not the rule at best.

If you’re going to the efforts of building your home to such a good standard, what a bag-o-crap it must be to litter it with £30 heaters you ran out to get from Argos when your wife told you “I told you ‘“ UFH is the number one way to heat imo, and in conjunction with a decent slab ( as opposed to a thin screed ) you can realistically plan for fine tuning your heat input to the nearest 0.5 degree. Heating by duct ( given it also commands a much higher airflow rate ) would be the last option for me to look at tbh as a generic MVHR should be near inaudible and unnoticeable in operation, and to use it for heating in anything other than a ‘small’ dwelling would take you away from that target. Accepting that higher flow rates are necessary, when cooling is utilised, is easy when you compare it to the rather unsympathetic alternatives ( split aircon ) etc.

Cant ignore an educated recommendation though eh?

QS was ~£200 for the above.

Hi If you plan on being hands on, a QS can give a valuable insight as to whats going to cost what. On an extension project I found it made an invaluable reference document to glean extras we had ( sometimes inadvertently ) undertaken, and basically identify anything that was above the original contact ( and therefore was chargeable ). If you're not hands on and are using a contractor then its equally of value IMO, for the Friday afternoon sit-downs where the stage payments are approved; eg how much work was supposed to have been done and what HAS been done to warrant the next stage payment.

Based on the ratio of what's available outside and what's available inside, in terms of transfer, I doubt there would be enough upward emitted light to 'pollute' .

In fairness, it does come with pretty clear instructions. I was just to tired to think last night.

The immersion in the SA occupies pretty much the entire floor of the cell. It's a single cell in each unit with a fully immersed heat exchanger for wet energy import / export. The immersion is actually entirely submerged / encapsulated in PCM, so as far as heat transfer characteristics are concerned it should be close to 100% efficient as it can get. No different to how an immersion is directly in the water of a cylinder. After initial talks with SA 'back in the day' I was led to believe the heat input should be liner, so a ~ 3kW immersion in a 9kWh SA should take ~ 3 hours to fully recharge. Re the element of heat loss, it's only really what ebbs away from the connective pipework really, so negligible but deffo will affect the times albeit only slightly.

@joe90 With both eyes open it reads that B aka DHW is the parked position of the valve. I’ll get my coat. It’s the mid position that parks in the heating position for pump overrun.

Hold that compliment. Replied to joe last night with one eye half open.

I could live with that.

Wasn’t there some ‘scheme’ where you rent out your roof space? Assume that was when FiT was high ?

Link ?

ASHP noisy, as its going bloody flat out !! Poor design, and probably even worse implementation.

If heated by the immersion, the thermistors look for the heating sequence to be 'bottom > top', but if heated by an external wet heat source via the Hex then the thermistors needs to be told to expect heat to arrive from the top > down. Therefore this is critical to ensure the correct thermistor is selected for fully charged 'status recognition'. This is the difference between each model sent out, as in the universal PCB is program 'pre-selelcted' to suit the application, given Joe Bloggs may be fitting it so it would need to be 'plug and play'. The boxes are essentially all the same, with the same Hex and same porting, just the electronics ( software ) differ. Quite handy to be able to reconfigure these to run in different applications later down the line without having to change the original unit tbh. NOTE : Once primary ( heating ) water has run through a Hex for any device or equipment it CANNOT be later utilised to convey potable ( drinking quality water ). eHw PCM58 / 9 = £1963 HW PCM58 / 9 = £1821 both +vat +del. For 12's its £142 less For 6's its....guess what So additional immersion costs are £142 across the range by the look of it. One consideration is the units aren't as tall with the immersion removed so are physically different eg more compact ( 45mm of less tallness-ness )

The other ( 2 way ) valve is called a diverter valve, as it diverts flow to either port. ??

Someone say dumb? ?

A few turns of ptfe over a heavily ( previously ) crushed olive makes for a good seal.

Scan reading strike again.

As it’s the manufacturer that will provide the warranty, ultimately it doesn’t matter what I say so if it were me I’d ascertain the average flow temp ( if the systems working ) and simply run it by their tech guys. For passive it’s a no brainer, but other instances would be for from a quick sense-check imo.

Most thinner screeds I’ve been around have a quite high flow temp to heat the spaces at the worse part of the year. Admittedly they’ve not been passive standard, some nowhere near, but have had flow temps as high as 35oC. It doesn’t actually get that hot at the ‘surface’ but I’d certainly run the system first and see where you are before choosing.

Progress

It’s what we do

Prob “long enough” for him lol.

Wrap them in off cuts of the flat roofing grey membrane ?