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Will look into undershot wheels this afternoon.

Brill. Will look at his blog tonight, and I may reach put to him too.

On a semi-related note, are there RHI grants for hydro?

The drop from our pond "exit" to the stream below will be between .50-.75m - so not huge. I will go down to the pond later and do measurements and then get around the calculations. Thanks for all the assistance and pointers. As always, it's massively appreciated.

No problems with informing our DNO - we've had to do that for our solar PV and ASHP. Would we still need to inform them if we're producing tiny amounts of power? I can't imagine us producing vast amounts of electricity. I may actually contact the guys that installed out ASHP to get a quote and see how much the kit will cost. Will also check out the book.

Will look into this - thanks for the pointer - could be worth a trip for sure.

We have a pond (about a quarter of an acre) that gets fed from numerous small streams and subterraneous sources, and the water feed is decent from autumn to spring especially when we get lots of rain. At the bottom of the pond, there is an overflow that has been concreted and this allow excess water to spill over into another stream that takes the water down the valley. This overflow gushes from autumn to spring. Based on this, I was wondering whether hydroelectric would be an option - it would obviously be on a very small (micro) scale, but was wondering whether we could generate 1-2kW (24/7) to help the ASHP over the winter months when the days are shorter and the solar PV isn't operating at maximum levels. Was wondering what an installation like this would entail, and would be need inverters and other expensive kit?

Water underfloor. Can I still inject epoxy?

So, the people we purchased our house from, laid underfloor heating and then put oak floorboards on top. We have now seen that there are two or three areas where the floorboards have come up a bit and are bouncy when you walk on them. We spoke to the previous owners recently, and they said (quiet amazingly) that they didn't fully level the floor before laying the UFH and subsequent floorboards, which has now led to this latest issue. Is there a way (an easy way) to rectify this? We have no intention of pulling everything up as that would be a massive upheaval.

The jigsaw is a good one... We're doing more and more wood work, so the iWorx multitool only allows me to do so much as it's not for precision cutting.

I’m going to have to google that. I have no idea what that is. Googled it. This is a game changer too. Agreed. I have in iWorx which isn’t as a good a brand, but I’ve only used mine a dozen times or so. Not very skilled at it yet.

Which tool revolutionized your DIY world? For me, it has been the impact driver.

I'll do you one better - I'll try and post a video tomorrow.

Totally agree - but I wanted a baseline (spring and summer) to gauge effectiveness over autumn and winter. I only collect temperature - should I also be collecting humidity?

We purchased a stack of 22mm quadrant beading and it arrived on Friday, so the week ahead is dedicated to laying it. Thanks for the heads up on Ron Currie - their prices have been great/

I've patched up the shed door this weekend. Thanks for all the advice.

Our air source heat pump has been in operation for five months, over spring and summer, so it is a good time to review the performance and efficiency of our Caernarfon 18kW Eco Air Source Heat Pump (ASHP) from Global Energy Systems. Most ASHP owners in the UK use Mitsubishi, Hitachi or Daiken ASHPs, so it should be interesting to see how a British manufactured ASHP, supposedly made for the British climate, will perform and compare. As part of this video, I’ve addressed our coefficient of performance (COP), performance and efficiency, the control panel and settings for the ASHP, noise rating and some general thoughts. As I am not an ASHP expert and still trying to learn, I look forward to receiving your feedback and comment. I always take all the feedback you guys at Buildhub have to offer on board, and find it extremely enlightening. I will do a follow up video in autumn and winter to provide a full performance and efficiency comparison. YouTube: Additional information and data sheets: http://myhomefarm.co.uk/air-source-heat-pump-efficiency-and-performance-review

I think I found what I've been looking for - it's called a kerf seal.

We have metres connected to our ASHP system that monitor our heating (DHW and CH, combined) versus the electricity used to generate that heat. I guess that leaves everything else (fridges, oven, computers, etc.). I was hoping to get an idea of how that electricity usage is split up because I'm convinced there are some appliances that are really energy hungry.

What would you recommend?

Right, so I think these are called gasket seals for doors - now my issue is that the track inside the door is really narrow, about 1mm and the gap between the two French doors is 10mm, and I can't seem to find a product that can slide into out 1mm slit.

That's very helpful. Thank you.

Do you run your ASHP 24/7 in winter?

Thanks Jeremy - are you on a variable rate with Bulb?

This may seem like an obvious question, but when I look at tariffs from electricity providers, what does "Variable" mean? Will this be a fixed rate or will it vary as per its name? It's looking increasingly likely that I'll switch to Bulb, but not really sure what they mean by variable.