MtB

I don't know and I'm no expert, but I'd expect them to have to be condensing the water vapour out of the POCs to get up to 85% fuel efficiency. Which I don't think they do.

Really? Do you really, genuinely think this is ok?

I think it might actually be 2,300 litres. When I order heating oil for the hovel, I have to fill in a written declaration to get the 5% VAT rate, and post it to the supplier if my order is more than 2,300 litres. I certify the supplies of fuel oil are for my own use as domestic heating oil or charity purposes. To the best of my knowledge it will remain valid for the foreseeable future / until ________________________________

The username concerned I suspect was "Tree". A lady who used to write in a kind of cutesy and mawkish language, often substituting a letter 'r' with a 'w'.

Yep I agree with all that, except I can imagine the bill coming in closer to £10k. Plus the (optional) PCA, of course.

I see what you did there, very clever!!

I have to say, I have a simple parallel hybrid LA/LFP on both of my boats with the 'long wire' installed to get the charge current low enough to avoid the alternator overheating. It works for me as I have an isolator switch on the LFP and I keep a weather eye on the LFP state of charge and turn it ON and OFF accordingly. This works fine for me but idea of such an installation on a boat used by someone who wants it all to 'just work' with no user intervention ever horrifies me. I think 'something' would go horribly wrong pretty quickly although I'm not sure what! In the long term my main concern is there is a risk of the LA batt getting old and shorting a cell which might be hard to spot.

Same here. I used to keep the stove alight 24/7 for the winter but not the summer. I'd typically wake feeling cold about 5am, reach up and turn the diesel heating on then sleep solidly and warmly for another three hours. (Control above my bed ).

I'd suggest the chances of this going horribly wrong are quite small. While the trad stern cabin is likely to be an area of the boat containing quite heavily stressed steel (to achieve the shape), you'll be cutting away the stressed bits. You'll have to add stiffening to hold the sides up though I'd suggest, so not a simple conversion. This thread however will probably descend into an argument over whether you'll need to spend £4k on a "Post Construction Assessment" after the work in order to comply with the law (the RCR). There is no enforcement of RCR and no consequences of ignoring it (other than possible difficulties selling the boat later), so I'd suggest there is little point in getting the insanely expensive PCA done.

Tedious. New posters have been forecasting this for the past 25 years. I've been a member of this forum since Dan started it as a schoolboy, back in the days of it being a flat file database which got infected and killed off by an early virus.

Oh no its not....

This is certainly my opinion too. I find myself invited to take part in a survey and the invitation is constructed in such a way as to provoke me to want take part in order to 'have my say' and express what I think of the product or service. Then the questions start coming and none of them gives me any chance to actually say what actually I think. Then the survey finishes, leaving me feeling cheated and used. Poor me.

Things are moving on the HVO front. At Reading Services eastbound on the M4 there is a sign at the entrance to the BP petrol station stating they now have "BP Bioenergy HVO". I tried to find the pump to check the price and perhaps buy some but couldn't, and being in a bit of a hurry I just made a note to look again another day. Edit to add: A bit of googling reveals this appears to be a BP fleet management fuel, probably not available for general resale. https://www.bp.com/en_gb/united-kingdom/home/products-and-services/bp-fleet/bp-bioenergy-hvo.html

Me too, although it might not be an air lock. It's reasonably certain there is no circulation. Whether this is due to an air lock, closed valves, failed pump or the simple lack of circulating fluid is not so certain.

In my extensive experience those two things have little correlation with real life technical expertise in practical issues.

Which is gonna come to a dead stop soon, one way or another... This link to an xkcd post illustrates your point wonderfully: https://xkcd.com/1732/

Thanks for the replies everyone. 3-layer tube? I've never heard of this, do you have a link to an example of it, possibly? Thanks. Indeed, and my OP was asking what that cut-off voltage actually is, please. Thanks. Same here, I too understand this. So prior to making an effort to find someone with that cable and software and paying them to do it, I thought it prudent to find out what that voltage actually is on a standard heater, hence my post asking what it is! Alan's mate thinks its about 12.5V. Any other bids?

Isn't the real original source of all fossil fuels, solar energy?

You are correct, I've never owned one so I'm not posting from personal experience. But I LIKE making assumptions! And I was just trying to provoke some discussion really as I fear the OP might be imagining the bog does the composing for him. (As I did in the early days of them, before I had a good look at one.)

I have a couple of these lying around which I've never tried to fit as received wisdom on here is they don't work well in boats as they require a higher battery voltage than a part-discharged LA bank supplies, and will stop running below that voltage. Does anyone know if there an exact terminal voltage they shut down at, and what that voltage might be? And given a LFP domestic bank maintains the system voltage slightly higher than a part-depleted LA bank, I'm wondering if an LFP domestic batt might keep an automotive Webasto running for most of the time.

Point of Order... Despite its large size, a "compost loo" does not produce any compost. YOU have to do that later, and probably in an area separate from the loo room. They are 'separating loos', not 'compost loos'. All they do is separate the wee from the poo and you have to have your own strategy for disposing of each. Some people choose to compost the poo. Others chuck it over the hedge or put it in the dog poo bins. Bear in mind they also stink unless you get one with a fan to blow the stink up a pipe to outside (so passers-by can sniff it instead) and you are back to your bog depleting your batteries in winter.

As a hire boat, is it allowed to navigate at night then? Or are the nav lights mandatory to comply with RCR perhaps, even though they will never be used?

Are you turning into Alan De E? Which page out of the 27 pages of tiny writing says that?

Excellent news. You'll be leaving soon then? (Hopefully.)

Never mind that, my last but four houses (1880-ish) had about 12 layers of wallpaper with some really big lumps showing. On removing it we found they were 1950s electrical junction boxes papered over.... And just don't ask about the eight layers of carpets all nailed down all over at about 6" centres!