Roz

I've just found them online and stillnot sure... https://www.grantuk.com/media/3710/grant-aerona-r32-installer-uk-doc-0136-rev-2-0-september-2020.pdf https://www.grantuk.com/media/1349/grant-aerona-user-uk-doc-0112-rev-10-april-2017.pdf

I'll pop back up and get the manual to have a proper read through!

Oh I didn't know what temperature they went up to sorry if the preheat thing was throwing us off track It's a Grant Aerona. There's this next to the manifold,(photo before installation) which has the ashp right outside it, but I was told there weren't any settings for me to be messing with in there...

Hi everyone We had our ASHP commissioned with our unvented cylinder and underfloor heating last week. They told me to increase the temperature every couple of days by a degree or so to protect the slab from cracking. I presumed they just meant increase via the room thermostat but now I'm thinking I should be looking at the flow temperature? Anyone any idea how to do that and if I need to? The ASHP should be heating the UFH directly, and also preheating the cyclinder forthe hot water. I've just set the hot water and heating to always on, as hot water was off before and heating had been put on a schedule. Also, our downstairs is currently 17 degrees when we get there in the morning even though the room thermostat is on 15 degrees, I think the dehumidifer is kicking out a lot of heat. Attached are some photos

If you don't need the extra buffer with the Daikin though, thats still a selling point as all these buffers are taking up very precious storage space

So the fact that the grant one is a floor mounted one wouldn't stop you doing it in this scenario? I thought maybe that had just made my decision for me but I'm not so lucky ? I'm not sure about how the buffer operates, I wish I knew more about the heating system but it's been one of the areas I've shied away from . I know that the merchants has said you don't need an extra buffer for the Daikin copared to the Grant, With the Daikin you have to get an 18l 'intermediate vessel' but with the grant you need the Grant Sealed System Kit as well as a floor mounted 30 litre buffer tank (which comes with Kit 2 :https://www.cityplumbing.co.uk/Grant-Aerona-3-Installation-Pack-2-(Incl-Eight-Core-Accessories-Plus-A-30L-Insulated-Volumiser)/p/470493?gmcpid=470493&gclid=CjwKCAjwlbr8BRA0EiwAnt4MTom45M-h3mwv5ojuy8U8y1uoFXjSMjPr47CczalekdDktULrIX6UYxoCeacQAvD_BwE&gclsrc=aw.ds#fo_c=2832&fo_k=aea9e118aa9151686c97a2d96f02ff32&fo_s=gplauk

Like this... apparently the grant buffers have to be floor mounted This is upstairs.

I was looking at £1970 plus vat for the 6kw Grant, their price is £1,338.43 which is a lot less! Nice find Edit: Their trustpilot reviews are weird I've got an issue with space though which might help make the decision between Daikin and Grant, apparently the Grant needs a 30 litre floor mounted buffer tank and we dont have any floor space for it... we just have a space in the top of a cupboard a metre away from the UVC?

I might be taking this off topic but I am actually not sure about whether we have or need a buffer. The list required for the Daikin includes solfex 18 litre intermediate vessel, the Kit for the grant either just includes the Grant sealed system kit or this plus a 30 litre buffer. We don't have much space for buffers if we dont need them. I think I was told that the Daikin doesn't need a buffer due to different set up but this could have been about something else, and that the buffers are about water temperature not dropping during defrost?

Sorry I didn't see your reply! theUFH loops are about 180m total The kit in question comes with a 12L expansion vessel and the telford tempest tank came with a buffer too I think The ASHP just goes to the UFH and the UVC. The manifold for the UFH is basically right next to the ASHP and the UVC is about 6-7m away in pipe length thanks!! p.s. I just noticed on a spec from city plumbing for the Daikin (which doesnt come with this kit as the kit is for the grant) they speced 10L of glycol but not sure which one

We're in Cornwall so rarely get below freezing Grant 6kw: 0C air 35C flow -6.2kw 0C air 55C flow- 5kw -3C air 35C flow - 5.9kw -3Cair 55C flow - 4.7kw I am trying to find the Daikin ones but their website keeps failing for me.

They've been giving a discount when I email them, which I heard from our plumber was the same price he gets, which he wasnt very happy about. But still I think the difference between the two will still be large.

Over £1000 from a quick look on city plumbing, which surprised me!

Gotcha. That makes sense (although we are now deciing between 6kw and 7kw, but I get your point) Yes we will eventually have a woodburner.

My electrician just put in the opposite recommendation for Daikin over Grant ?

Thanks Dave! But if the heat requirement is 3846Watts without the DHW added on, if they run them separately wouldn't that be fine? Sorry if I am getting muddled.

I have recently been recommended a Grant over a Daikin and after taking all the advice on board originally and deciding to go for the 7kw Daikin, the Grant comes in a 6kw or a 10kw. The 6kw grant is a similar price to the 7kw daikin. It seems like I might be on the edge of 6kw being ok according to these numbers... but is it risky? I don't really want to make another leap in price to a 10kw heat pump to be honest so I am wondering which is better?! @ProDave @Nickfromwales I guess if you take off the DHW at the same time it would be OK but I am not sure if you agreed this was ok haha. The ebay heat pump worries meeee so havent spent much time looking at that!

Hi guys We're getting our air source heat pump installed next week, you can buy an installation kit to go with it which includes antifreeze, but as we don't need some of the other stuff it comes with as we already have it, I am looking at getting things separately in case it works out financially. I can see the antifreeze in the kit is HP-5c 25l. It comes as 25L in the kit but how do I know if I need this much? The flow and return pipes are about 6-7 m long each if that helps. When I look this up it also brings up HP-5 which is a lot cheaper - anyone any idea of the difference? thanks and I know I should ask the guy installing it but he is not very chatty so thought I would do some groundwork...

Daikin seemed to be the cheapest heat pump we could get, but after bumping up to a 7kw and adding on a third party cylinder fittings kit, plus the control panel and controller, we were then advised that Daikin aren't preferred and that Grant are better... who knows. But when I get a price for the Grant heat pump it doesnt seem to have the 'controller' and 'control box' so I don't know if it's equivalent. I asked and was told it was included in the 'installation kit' but I can't see an equivalent in there? Anyone shed any light because I have no idea what the necessities are. Daikin 7kw £1940 Controller £79 control box £196 Third party cylinder kit: £185 Grant Aerona 6kw £1970 Installation kit: £430 prices plus vat https://www.cityplumbing.co.uk/Grant-Aerona-3-Installation-Pack-1-(Incl-Eight-Core-Accessories)/p/470492?uiel=Desktop

I didn't. Our larch is almost finished but we've done it slowly, so some of it has started to silver already . Planning to sioo:x once it's all up. I figured that you're sort of paying to have it done on both sides when you only really need it done on one... so that was my thinking. I know they recommend you do it on all sides, but they also say you can use it to revitalise old cladding / decking, so it's obviously not completely necessary.

ooooh good point

Thanks everyone! It is actually vertical space that was the issue anyway, it's going under a sloping roof. I was hoping the expansion vessel could go up in the top of a wardrobe space (basically further up the sloping roof) about a metre away horizontally, but not sure our plumber knew what I meant so I don't know if this is OK @Nickfromwales ? Great thanks Nick, I will mention a boost switch to him, I think I thought this would just be an option with the programmers/controllers so good to know you need an extra thing! and thanks @A_L and @Nickfromwales for confirming 5kw might be too small, better to play it safe then.

We are running the underfloor direct too, we've been given this diagram but we don't have the radiator section We didn't have space for larger than 200L unfortunately. Will see how we get on with water consumption, there are only two of us 006_2016 - Hydraulic - Monobloc Dual Setpoint Rads & UFH.pdf

what does the buffer tank do and why wouldn't you have one? Ive been told we need one but not sure if that was in reference to the ASHP. So I am confused, if you send 48 degrees to the DHW but you want to get more hot water out of it, can you top up the tank to a higher temperature, then use less but hotter water and blend the temperature at the tap? If you want the tank to go further. Not sure if this makes sense

Also @ProDave and anyone else that know the answer I guess. I got a Telford tank on recommendation from this forum actually, but I might be starting to regret it. Apparently the merchant or Daikin have told our plumber that we need a 'third party kit' because of the cylinder not being Daikin. It's probably a bit premature to ask this question because I am waiting to find out what this kit involves, but at the cost of £200 or £250 it's making it seem like I should have got the Daikin water tank, which seemingly would have ended up a similar price according to this list I have from the merchant. Has anyone else experience with a 'third party kit' and what it involves? EDIT: Google gives me this picture, still don't really know what it is