ashthekid

3 phase was already existing at the property when I purchased it and all electricians have said it's great that we have it so decided to keep it. We only have an array of 11 panels running at just under 4kW with SolarEdge optimisers. 3 phase or single inverter now you know that?

Hi, This may seem like a silly question but would I be correct in thinking my inverter phase must match the phase coming into my property? I have 3 phase coming in but I've just noticed in my solar summary report that it's planned to have a SolarEdge HD Wave single phase inverter. Does that sound right? Does it make a difference?

No MVHR but thinking of putting dMEV in from these rooms as I don't have enough outlets through the roof upstairs and can't go out the external walls as its terraced. Here's the floor plan. Am thinking dMev for the cinema room, utility, WC and bathroom to the utility cupboard where the red box is and outlet up through the roof to the only spare outlet is. Then the pantry can be extracted through the boiler room and merge with that outlet hole. Does that all make logical sense? And trickle ventilation wise, I just have door gaps underneath the cinema room entry door, utility entry door and pantry door I can have a grill on the bottom as it's made to look like a fake kitchen cupboard door so that will be easy. Ideally won't want to have to put sizeable 100mm vents in the walls. Especially the cinema room where the sound will really pass through.

i asked my Building Control what ventilation would be needed in some ground floor rooms(example, cinema room, utility room, pantry, toilet) that do not have any natural form like windows and said they all "should have mechanical ventilation to ensure adequate air changes and they all need some trickle ventilation" When says they all need some trickle ventilation too what does he mean? I assumed that was only possible through windows? Does he mean through doors in those rooms?

Daikin have a fairly new 16kW Altherma 3 split system that uses the new R32 but I cannot find it anywhere online where it states it can be used over distances of 40m which is what I need. Any help on finding that?

My contractor has left my project half way through the build on my conversion project from a commercial property into a residential dwelling. upon his invoicing until he left he charged me the correct 5% that I was told by a VAT specialist who I was recommended from one of the popular housebuilding magazines. However now I have taken over the project directly myself and am getting conflicting responses from companies, some will allow me to be charged 5% by them and some are saying no, they must either charge the full 20% and I do the reclaim myself at the end of the project or they are saying for me to provide proof from the HMRC that my project should be charged at the 5% rate. How do I get this letter? It would save me a lot of hassle and admin at the end of the project for a lot of the work taking place. And also I keep hearing these horror stories of people being unsuccessful in their claim at the end with HMRC.

Yes MVHR would be ideal if it wasn't so expensive. I had already briefly looked into it and no company would do a small section MVHR setup, only whole house and that was running into the thousands then. Sadly I can't afford that. I can't go through the roof with any new outlets but can certainly try and merge ducts into existing roof outlets. If that's allowed by building reg standards.

Any thoughts on this?

Any more thoughts on this?

Here is the floorplan for the ground floor. I've marked in red the only windows we have with trickle vents. To the south there is the directly connected neighbour so no chance of any wall outlets and to the north is the neighbours garden and the solid wall from the pantry all the way to the west is an old chalk cob wall that will be impossible to have an outlet. The only place possible for an outlet is the north wall between cloakroom and boiler room. And because we are in a conservation area I cannot just have loads of modern outlets.

Does it matter if it's a conversion project (and change of use from commercial to residential) and not a new build with regards to the build reg expectations?

Hi, This may seem like a silly question but is it allowed by building regulation/control to have multiple extraction fans share ducting to one exterior outlet? Is yes is there a limit on how many are allowed? I have a couple of rooms with no windows or natural ventilation that I'm assuming will have to have some sort of extraction but to keep things simple and not have excessive ducting all over the place I thought it sensible to have, for example, the TV room, utility room, pantry and toilet all extract to one outlet. Of course it may seem risky to have a toilet connected to the same ducting as the TV room in case of smells passing through?!? I just wasn't sure of the building regulation for this topic.

I've had two quotes from different heating companies and they have recommended these two: Hitachi Yutaki S80 16kW - high temp with rads upstairs COP 4.57 Energy class A++ or Daikin Altherma - low temp with UFH upstairs COP 4.20 (I think) What are people's thoughts on these two and which one is better/newer/more efficient?

I can't get it closer together as the garden is extremely narrow so it would take up the whole patio so it makes more sense to put at the very rear of the narrow garden. Have neighbours either side and behind the rear of the garden so it's a tricky one with only one solution which is a split system. My gut keeps telling me to go for the LG Therma V R32 but i just had another quote and they suggested the Hitachi Yutaki S80 again. But the 16 kW unit which makes a lot more sense for me. I'm not sure of how it does this, it doesn't detail it in the brochure. Hitachi High Temp Heating and DHW Install Pack.pdf

64 power 50 pressure according to Hitachi brochure

Anyone had a Hitachi S80 installed as their air source heat pump? My energy consultant is now recommending a nominal 14Kw (max 16.7Kw) unit as my SAP calcs suggest I will require 15.7Kw to heat my property and hot water. The unit is approx 25m from the property and then anotehr 15m to where the boiler room is to be located so running a good 40m worth of air con pipework both externally and internally. Apparently the S80 High Temp heat pump can run upto 75+m. And what about noise for this particular unit? It's a double fan so I'm guessing it will be quite noisy compared to others? If I've found the correct unit online it states about 65 dBa for the outdoor unit. that seemed pretty high.

Would you take a risk on such a system?

Has anyone ever heard of this brand of air source heat pump? They look a little bit like a Darlick compared to other units. I cannot find any reviews anywhere online but one of my heating/plumbing quotes has really pushed to use this brand and on paper it sounds good. Anyone had any experience?

For two oak king trusses to be installed (that i already have on site) approx 7-8m in length each. What would one expect to pay for the installation? Assuming it's a 3 day job and would require the necessary genie lift to raise them into place etc.

@MG-Wales As these are not birdmouthed as suggested would I still need the truss clips? And does the top horizontal timber that the rafters are sat on needing to be double timber or is the single enough? All I want to make sure is just that everything is safe, secure and would more than pass any building control inspection. I'd rather go over the top and feel better about it.

3 Phase is already in the property so I am just wondering if there would be any extra benefits by having a specific 3 phase heat pump? 16 Kw is what size heat pump i've been told i would need to service the property. I do have solar PV panels freshly installed and do intend to future proof myself by having an EV charging station installed.

Yes this is for external use but i don't like the bulky standard outdoor sockets that would stick right out on the brick wall surface. @Roundtuit That makes a lot of sense, at least that would get rid of some that bulk. I don't mind them sticking out a little bit.

Is there such a product that is basically a double socket that fits perfectly into a brick slot? So the box is flush rather that sticking out?

16 Kw @dpmiller

Are there any benefits or disadvantages of these two types of ASHP?