JIH

I'm going with marine ply, painted with an epoxy paint. An in-house, comparatively cheap solution that I'm hoping will look ok

Thanks for the info @SteamyTea. The simplicity of immersion heater on E7/E10 for DHW is an attractive option. However I am concerned regarding the standing losses, especially given the experience of @JSHarris as I have a similar spec house. I don't want to end up with an overheating problem.

ok - ideas on how to drive it? immersion? IWH? SunAmp? any other ideas?

Then just keep pressing the button!

Mixer showers with push button to give timed flow. Yes - thanks about that aspect of E10!

Regarding heating demand, I've punched in my numbers into JH's spreadsheet and get a minimum OAT of 10100 kWh/yr. But my understanding is that there are no allowances for any incidental background heat from occupants etc in this calculation. If I allow 900W/day this gives a minimum OAT of 2400kWh/yr. Does this sound reasonable? Regarding DHW - envisage normal use being 2 showers per day. By using push button showers (thermostatic mixers) I hope to restrict daily usage to 100-140 litres/day. Unsure of incoming water temperature as yet as well still to be dug,

I'm trying to consider options for my DHW and have put my understanding of possible options into 5 broad brushstroke 'models' on the attached pdf, together with pros and cons. I've put these together from what I've gleaned reading on the forum, but as my experience of DHW is limited to a kettle (but later upgraded to an immersion heater) I may have got my wires crossed! I really need to get the big picture of what options are open to me and would appreciate suggestions. I have no mains gas, a low heating demand ('passive' type house) and low DHW demand (2 x push button showers + bath). I have no PV alas, but may ground mount a non FIT ~2kW array at a later date. I will be digging a well with a pressure vessel on supply so should have no problems with there, hopefully. I would be very interested to hear how others have or plan to cope with DHW supply, or comment on my listed models. Is it me or this a particularly difficult nut to crack without gas?? dhw & heating models.pdf

Great idea, thanks Ian. Did you bend yours? Was wondering what sort of radius you can get with it.

I'm looking for advice on what size of conduit I should put in my external wall to take the water pipes for my, yet to be purchased ASHP. I need to get this conduit installed before the insulation is blown but am unsure of how much room pipes plus lagging will require. Many thanks.

I laid a non woven geo-textile down prior to the insulation and left oversized. I then stuck this up onto the insulation after concrete poured, resulting in all the insulation encased within geo-textile. Before ground level comes up I will clad over the upper portion with a PVC board. BC were happy with this build up.

I'm thinking of using something like this: http://www.newblinds.co.uk/content/solar_film_roller_blinds/ They are used extensively for bridge windows on vessels. At the moment the scaffolding is doing a good job deflecting my solar gain?