Post and beam

Hi Nick Agree no to Rega-vent. Their unit looks like rubbish when you see inside it. I had the joy of seeing one of their part finished installs recently as well. I could not commit to spending £7k on that. So i used that figure and priced up a kit of parts for a Brink 400 and 90mm ducting. That appears to come to about £5k. This would leave me £2k to get it commissioned and signed off and i would be no worse off financially but would have a top notch install.

The 60l/s figure comes from the quote i have from Regavent. also .3 x area which is 200 m3 in my case. As per another post i raised, with no other knowledge to base my figures on i have been using the 60 l/s. I have read such good things about the Brink/Ubink 400 that i would be amazed if it were not suitable and your comments bear that out.

It came from 1.27 of part F. However, having just re read it i think i misunderstood. Its been a long day. Purge ventilation rather than boost as i stated means opening the windows.

I believed the Ubbink 400 was a good choice for my prospective house design ( planning granted today !). 200 sq/m requiring 60 l/s, apparently. From the manual the 5 speed settings give the following # 0 = 50 m3/hr, 14 l/s # 1 = 100 m3/hr, 28 l/s # 2 =200 m3/hr, 55.5 l/s # 3 =300 m3/hr, 83 l/s #max = 400m3/hr, 111 '/s I have no way of knowing if the 5 speed settings are equally spaced from 0 to full. So, my 60 l/s would need speed set at 2. Does this look like it will be operating in a quiet enough part of its range to be a wise choice after all? Also, how does the boost requirement of 4 ACH fit into this model As always guys, wise words gratefully taken on board

That's sort of why i have been asking loads of questions on here about prices i have been given for ASHP, UFH and MVHR. Some suppliers are taking the P!ss Have not seen a bargain yet to jump on

Now the expensive bit begins. 10 weeks from submission is pretty good i think.

Thanks Guys, as i said this is what Potton told me as well. Am i wrong in my belief that build regs require heating to all rooms? If true it is in conflict with this idea.

A potential concern is the long term weather protection of the circuitry under the covers. Its not sealed from what i can see. I'm sure no rain can get in but condensation is a worry. Would love to hear from anyone that has had one for any length of time.

I am in a similar boat, New build SIPS house hopefully starting soon. The quotes for UFH upstairs are even more eye watering than for downstairs. I am content that the need for any heating upsatirs will be minimal at most. In fact the TF company ( Potton homes) believe you dont need any heating upsatirs at all, except perhaps heated towel radiators in the bathrooms ' that'll be plenty' they say. However, i understand building regs say that there must be heating upstiars. So, we are going with radiators in the bedrooms but very small. A token jesture almost.

If i take the 60l/s as a valid whole house figure, is it usual practice to do the following? With no other previous knowledge to go on i have broken out the volumes of the rooms that require supply and taken their % of the total. Then used that to divide the 60 l/s into per room supply rates. So, for example my living room is 42 sq/m which is 38% of the total. 38% of 60 l/s is 22.8. From this ( if correct) i will need 3 x 90mm to keep just below the 2 m/s velocity. Please critique away guys.

A perfect example of location,location,location. I dont see it as a £7m house but knowing the area its not a suprise

Thanks Nick, again.

I get the principle, its the actual numbers i need to get my head around. For example if my living room is 42 sq/m, its a 15 metre run and i use 90mm round duct. will i achieve a quiet sytem at the required flow rate. For this size room i actually expect that i will need either a double run or, more likely, 2 single runs to opposite corners of the room.

Hi Nick Mechanical bends. I want to use the Ubink air excellent system.

Thats Hampstead. About as insane as it gets i think

Thanks Nick. Its rationel that i am trying to find an alternative to. so that wont work.

I am having a little difficulty understanding the pressure drop/ airspeed ratio thing. If i am correct the magic number is less than 2 metres/second to achieve a quiet outlet. So, what should i expect per 15 metre run of 90mm with , say, 2 90 degree bends ?

Do you have 2 x 75mm or 2 x 90mm?

My planned Potton is a 200 sq/m house. I think the longest duct run will be from the loft space to the far end of the living room. This will be 15 metres as best as i can estimate it. A previous quote and design ( from a company i dont intend to use) said i need a house total of 60 litres/second. Will a single 90mm duct be sufficient? If its good for the living room run then it should be good for everything else.

Has anyone any user info on their new range. Are they badge engineering something else?

Intrigued. Do tell

Put a resistor across the terminals and see if the pump fires up?

We appear to have slightly hijacked Sarah's post

Except that this is not my experience with them. As i said earlier. They have offered a phase 2 subsequent to the frame erection ( phase 1). Within this phase 2 quote they have specified Redland rosemary clay tiles and were not keen on me looking for an alternative. Now, it is true that i can find my own contractor to take the project to weathertight. This would give me all the freedom i want to choose. But, i like the idea of Potton doing both phase 1 and 2. Just wish they were a little more flexible. Its a call i need to make soon as to which way i go

They do offer a choice of glazing. From a list of 2 in our case, Rationel and a company in Suffolk. We have gone with Rationel Alu clad. They used to favour Bereco solid wood. Perhaps we dont look like we can afford those! The people they specify are themselves. Who that actually turns out to be is unknown at the moment.