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Posted By: crusoeUnless you are a solar designer/accredited installer. Anything else and you will be outside building regs...
Posted By: Ed DaviesOnly 2 metre head though which could be a problem depending on your system set up
Posted By: tonywhat is wrong with fully filled one?
Posted By: tonyWhen you say 5m head is this from the level of fluid in the drain back reservoir to the top of the panel?
Posted By: fostertomThe pump can run on PV
Posted By: tonyit could if it didnt have to lift the water so high.
Posted By: crusoeA simple-but-effective, and last-forever S/S drainback ensemble is made by German firm PAW.
Posted By: an02ew1kw solar dump (a crude AGS) in the ground under our house.
Posted By: an02ewMy good friend and old solar thermal installer Mark has express mild concern of overheat.
Posted By: crusoeEd: Of course drainback is pressurised. Just because it is filled at atmospheric and there is no expansion vessel does not mean it is not pressurised.
The air volume above the fill-exit point in a drainback system will take up the slack as the fluid heats, but all drainback/flowback (pick your moniker) will have a PRV as standard...if supplied by an approved supplier.
If not approved - ie proprietary product it won't get signed off.
What are you saying? Use non-approved product?
Posted By: crusoeBuy a proprietary kit. Unless you are a solar designer/accredited installer. Anything else and you will be outside building regs and safety standards.
Posted By: Ed DaviesCentral heating systems with an FE tank don't have a PRV; why should an ST system in the same circumstances?
Posted By: crusoeThere is no requirement for PRV in open vent in the UK, but in colder climates I do understand the precaution.
Posted By: fostertomPosted By: fostertomThe pump can run on PVPosted By: tonyit could if it didnt have to lift the water so high.Eh?
Posted By: davidfreeboroughDrainback systems often have two pumps; a high power one to lift the water into the solar thermal collectors initially & a lower power one to circulate the water once the collectors are charged.
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