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I'm guessing it would be an indirect one seeing as our current HW is gas? Are they any better/worse than direct?
Not really sure. I guess mine is both in as much as it is usually heated indirectly by the gas boiler next to it but it has an immersion heater element too so I can have hot water if the boiler is off/broken. Not used the immersion heater yet.
I upgraded my supply pipe when the Megaflo was fitted. Seemed sensible to ditch the lead and put in MDPE anyway.
I had a Megaflo installed when we did our loft. Lots of hot water, lots of pressure, just works. Assumes you have enough mains pressure in the first place though.