Adrian Walker

Crazy idea. And the stove is a no-no

It is operationally profitable. It's interesting that it has to launch over 2,000+ satellites every year.

That's unlikely as the signal is very weak and the cost to run satellites is very high.

How old is the slab. What self levelling concrete did you use?

An insulated concrete slab is better if you need a radon membrane, as beam & block can create voids where the gas will accumulate. Radon gas is a silent killer.

The reason that some people put heaters in bathrooms is that after a shower, you are wet & naked and Evaporative Cooling takes place. If this is a problem, it's better to use infrared heaters/panels. You certainly don't need any UFH, either wet and electric upstairs in a Passive House.

What’s your budget for a project manager?

Best solution is an insulated concrete slab IMHO

If you want a healthy & happy home you should have MVHR. It doesn’t take a lot of room, you can self install and will save on your heating bills.

You should aim to get a better air leakage of 3.

Lewis decking is a good idea, but it won't need UFH. I wouldn't use air to heat the house, it's a poor way to put heat into the slab. You want a uniform and constant temperature that only UFH can provide. I have visited a certified passive house that didn't have UFH, it's was a disaster.

You should be looking and considering an insulated concrete slab with UFH. UFH pipes can be used to both distribute heat and cool.

There are no benefits or advantages in DC light systems in a residential property. LEDs might be DC, but the drivers and controllers are relatively cheap, reliable and available. Overall I2R losses make it inefficient.

In Scotland and in the North of England they often don't use cellular, instead, they connect via a dedicated Long-Range Radio network at 400MHz which travels futher.

Do you have any mobile phone signal at all? If so you can ask for an T3 External Aerial to be added to a smart meter. I wouldn't take no for an answer, the national network (DCC) is required to cover 99.25% of all premises. Demand a Technical Site Survey or a physical visit. Tell them you want an engineer to test the signal at the actual meter point, not just a desk-based estimate. Additionally, when a meter is faulty or reaches the end of its life, the law states the supplier must replace it with a smart meter unless there is a valid reason not to.