OldSpot

Probably be better to write in that T's need the LL's permission, that would probably cover both angles.

Thanks for your reply John. As you allude, there is a difference between PP and CP and the UPM3 AUTO has auto adapt for both. I think in your answer you're talking about the PP not working properly not the CP auto adapt?

I've got a Grundfos UPM3 AUTO 25 70 130 on an Ivar UFH manifold. Just trying to work out why you wouldn't just run it in the "Constant Pressure Auto Adapt" mode as opposed to any of the other 3 Constant Pressure settings as this seems to cover all bases? Or have I completely misunderstood!?

Thanks for your thoughts. It might have been better if I'd have put "if someone wanted to..." as I'm interested in whether this route is permitted in the circumstances 😉

I'd be interested in people's thoughts on the following. If I wanted to building a separate dwelling in my garden but it required me to demolition part of the existing house (single storey extension) to do so could the Planning in Principle route be used? My view, having read the various documents, is that it can't as partial demolition (or alteration) constitutes building operations which is defined as "development" and...... Householder development is specifically excluded from using the PiP route. According to The Town and Country Planning (Permission in Principle) (Amendment) Order 2017, LPA’s can only granted permission via that route under certain circumstances. They are not able to granted permission under PiP when the application is in relation to “Householder Development”. Section 5B(5) of that Order states that Householder development means “development of an existing dwelling, or development within the curtilage of such a dwelling for any purpose incidental to the enjoyment of the dwelling, but does not include change of use or change in the number of dwellings in a building;” So it then comes down to what development of an existing dwelling means. The Town and Country Planning Act 1990 has a section on what is classified as development: That states in Section 55 (1):“Subject to the following provisions of this section, in this Act, except where the context otherwise requires, “development,” means the carrying out of building, engineering, mining or other operations in, on, over or under land, or the making of any material change in the use of any buildings or other land” And then further in (1A)…"For the purposes of this Act “ building operations ” includes—(a)demolition of buildings; (b)rebuilding;(c)structural alterations of or additions to buildings; and (d) other operations normally undertaken by a person carrying on business as a builder.]" So it seems that if you demolition part of an existing dwelling to seek permission for a new dwelling to be built the PiP route can't be used. Thoughts?

Further investigation has revealed this is the standard of construction I'm left to deal with!! That's the rafters siting on the ridge beam Having done a bit more research, I came across this suggested solution from an engineering forum: bearing on top of steel ridge beam

Just realised I posted this in the wrong section so re-posting here... I wonder whether anyone could offer any thoughts on this connection detail please? The extension we have has a steel ridge beam to allow a vaulted ceiling. The rafters have been skewed to a 2" timber with what look like your standard nail gun framing nails. The timber has been bolted to the steel i-beam. Make-up is as shown in the picture below. The rafters haven't been birds-mouthed onto the timber but are just as shown. (The horizontal timber shown is a ceiling joist so doesn't extend from wall plate to wall plate and is about a 1.4m down from the ridge. Floor to ceiling is 2.5m) Any thoughts as I'm slightly concerned about the roof loading and restraint onto the steel.

Thanks all. Alas I fear that's exactly what might be happening 😡.

Thanks Tommo, I wouldn't guess it but unfortunately it's already built (before we bought the property)!

I wonder whether anyone could offer any thoughts on this connection detail please? The extension we have has a steel ridge beam to allow a vaulted ceiling. The rafters have been skewed to a 2" timber with what look like your standard nail gun framing nails. The timber has been bolted to the steel i-beam. Make-up is as shown in the picture below. The rafters haven't been birds-mouthed onto the timber but are just as shown. (The horizontal timber shown is a ceiling joist so doesn't extend from wall plate to wall plate and is about a 1.4m down from the ridge. Floor to ceiling is 2.5m) Any thoughts as I'm slightly concerned about the roof loading and restraint onto the steel.

Thanks both, that helps!

Can someone help me understand these figures please? For example, the first model says at an ambient temp of 7/6c and a water in temp of 30c and out of 35c, it has a nominal capacity of 6kW but it also has a heating capacity range of 3.10 - 8.90kW so can output more than the nominal by 2.9kW..? Presuming there is a direct relationship between Heating capacity and Heating Power Input? i.e Input = 2.10kW, Output = 8.90kW On the MCS product pages, they list an SCOP at different flow temperatures - what ambient temperature is this measured at and is there anywhere to see the SCOp at different ambient temperatures. How did you determine this James? Many thanks.

Yeah I agree James, it is a bit thin on the ground and requires significant searching to find anything! The "glossy brochure" has a bit more data.....(here) and includes the sound power level iaw EN12102 Just on the subject of noise: I see from the noise calcualtion that note 4 only extends out to 30m. If the distance to your neighbour is >30m can you account for the lower sound level at an increased distance? Common sense would suggest so but this is planning we're talking about!

Thanks both. Done a little more digging and they are made by Guangdong Phnix Eco-Energy Solution Ltd and appear to be the same ones as sold by Earth Save Products The MCS data ( MCS code BSI KM 748508/7 ) suggests an SCOP of 4.96 wi@ 35Cth a flow temperature of 35c for the 9kW one.

Came across these ASHPs recently and wondered if anyone had any thoughts on them? Ecoheat Superheat Seem pretty cheap but can't find any detailed specs for them?