Air Blocks in water system after Power outage

[raybarrell]

Do any Plumber Boffs know of an automatic release valve that can be installed in our water system, to stop or reduce air blockage after power outage. This is particularly relevant to our hot water system ( which is solar ) and sometimes takes 3 or 4 days for us to retrieve hot water again from the tank in the attic. Is it possible to install an auto release valve for the air in the system, here in Thailand? Thanks

[KittenKong]

We had at least 6 of these back in Europe in the central heating system of a very large house where the pipes went up and down all over the place. Never had the slightest trouble with them.

They are so simple that they surely must be available here.

[Rimmer]

Moved to DIY forum

[IMHO]

Is there a one-way valve on the inlet side of the solar hot water tank? if not, it's possibly back feeding other taps when the pump is out.

[RichCor]

As KittenKong wrote, sounds like you need to install an Automatic Air Vent / Air Eliminator on your cold-inlet side.

Fivalco Automatic Air Vent

RACI™ Air Valves

Spirax/Sarco Air Vents & Air Eliminators

And as IMHO states, installing a one-way/non-return (closed-system anti-siphon) on your hot-outlet would prevent air from being sucked back into your passive solar heating system.

While some air pockets are produced as a normal process of off-gassing (release of a gas that was previously dissolved/absorbed into solution), more likely there is another ingress point that occurs when the system experiences a negative pressure event. It would be helpful to understand where the air is being introduced.

Any 'dripping leak' can easily turn into an air ingress point during a negative pressure event.

[raybarrell]

Thx for your advice and help