Heating system for new build

horsenaughton

Currently building a house and thinking of what heating system to go with. I'm building a story and a half and I am planning on going with solar panel/tubes for the water, then going with mechanical ventilation system along with air to water system and stove with boiler to heat the house. I'm planning on going with rads then throughout the house. Just wondering if this will be enough or would oil back up work along with this system. I'm totally new to all this and looking for any advise anyone can give me and if anyone has advice on where to look up info on these systems I'd be grateful for any help.

BryanF

What does your provisional BER say?

Calahonda52

As well as the BER, what renewables are compulsory with your planning permission, or did you bother with that bit?

Have you anyone advising you on this or is its a DIY/bar mat design self build

The kit you have outlined is madly complicated, IMO.

What is the energy demand calc for the house?
What is the Airtightness target for the MHVR?
What U values have you got in the design?
The attached will get you started, note they are the absolute minimum.

Re the A2W heat pump and rads, it is not a good mix but can be done if the rads are sized accordingly but they will be maybe 1.5 to 2 times bigger than for a conventional OFCH system due to the lower delta T used in the calculations.

from here
https://www.radiatorshop.co.uk/faqs/
What is the difference between Delta T50 degrees C and Delta T60 degrees C in relation to heat output?
Delta T50C is the European recognized standard for calculating heat outputs. This typically assumes a boiler flow temperature of 75C, a return of 65C and a room temperature of 20C. This is applicable to most domestic heating systems. Similarly, Delta T60C typically assumes a boiler flow temperature of 85C, a return of 75C and a room temperature of 20C. This means that for most domestic applications, a heat output listed at Delta T60C needs to be multiplied by 0.79 to convert it to Delta T50C, so as to make the heat output that can be achieved more accurate.

So you need to know what the heat pump will output in mid winter with outside temp of say minus 10

The heat pump may make use of elec to make up the delta T shortfall but it will be expensive ..

PS
Just noticed the 1.5 storey: whats the roof design and what plans for making sure the all design is up to it?

murphaph

I'd originally planned low temp rads in the cellar and UFH elsewhere (A2W heat pump) but when I saw the size of the rads we'd need I went for UFH in the cellar too. Bloody huge great things and then you're running low temp water through steel rads which will corrode over time and that rust ends up in your heat pump. No thanks. Plastic UFH with stainless manifolds throughout now and hopefully years of maintenance free comfort. Placing furniture with those huge rads will be a nightmare.