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Posted By: SteveZThe problem I can see is the fitting for an immersion heater might have to break the integrity of the liner, unless you devise an internal watertight box or compartment for it.
Posted By: davidfreeboroughI think they've avoided immersion heaters for the reasons you describe & because one mounted in the lid might become uncovered if the water level is wrong.
Posted By: SteamyTeaI maybe should have been clearer, what I meant was using an ordinary PE tank as a drainback tank without any special reinforcement.
One solution was to use a more expensive plastic, but they ended up using the same plastic but a lot thinner as this allowed the drink to cool before it had time to distort the cup.
And that is why we have hopelessly thin, nasty brown cups filled with dreadful tasting tea.
Posted By: fostertom2000 litre used orange juice barrels £100.
Posted By: davidfreeboroughRotex offer a wider range of solar thermal drainback tanks than I realised. Most are available with optional top mounted 3kW immersion heaters.More interestingly, one of their solar thermal drainback tanks integrates the indoor unit of a split system air source heat pump:http://en.rotex-heating.com/products/heat-pump/heat-pump-for-new-build.htmlIt provides domestic hot water & low temperature heating & includes everything you require to connect the refigerant lines from the ASHP outdoor unit, the flow/return to solar drainback panels & the flow/return to underfloor heating. Domestic hot water is provided by a 6m2 internal heat exchanger coil. The outdoor unit seems to be a re-badged Daikin box.Does anyone have any experience of this system?David
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