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Fiamma A20 Expansion Tank

Name: Fiamma A20 Expansion Tank
Brand: Fiamma
SKU: 227880
Price: 28.59 GBP
Availability: InStock
Rating: 4.81 (21 reviews)

Product Ref: 227880
Fiamma Code : 02478-03-

£28.59(inc VAT) £34.99Product Ref: 227880
Fiamma Code : 02478-03-

(4.81/5) Read Reviews - Click Here (21 reviews)

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Product Description

The Fiamma A20 Expansion Tank is a universal accumulator tank designed for caravan, motorhome, campervan and marine water systems. It installs on the pressurised side of your 12v water pump, between the pump outlet and your taps, and works with all pressure switch diaphragm pumps including Shurflo, Flojet, Whale and Fiamma's own Aqua 8. Measuring 234 x 154 x 98mm and weighing around 300g, it's compact enough to fit into tight spaces. The A20 comes pre-charged at 0.9 bar (13 psi), which is the correct setting for Fiamma pumps with a 1.5 bar pressure switch. For other pump brands, the pre-charge pressure is adjustable via a valve using a standard air compressor or foot pump, up to a maximum of 3 bar. Fiamma recommend installing it within the first metre of your water system's pressurised pipework for best results.

How does the Fiamma A20 stop a caravan water pump from pulsing?

The A20 uses an internal pressurised diaphragm to absorb the pressure spikes created each time your pump cycles on and off. This converts the stop-start surging into a smooth, steady flow of water at consistent pressure. For a caravan or motorhome owner, that means no more pulsating taps, no rattling pipework, and no fluctuating shower temperatures caused by rapid pump cycling.

The tank is supplied with straight and angled 13mm barbed hose connectors plus self-tapping screws for mounting. If your vehicle uses 12mm semi-rigid pipe with push-fit connections, you'll need 1/2" BSP to 12mm push-fit adaptors instead of the supplied barbed fittings. The A20 is made from food-grade safe materials and is fully dismantlable for diaphragm inspection or replacement. Fiamma recommend checking the pre-charge value once a year, and the tank should be drained completely if outdoor temperatures are expected to drop below 0 degrees C during winter storage. By reducing how often the pump cycles, the A20 also extends the working life of both your pump and water heater while lowering water and electricity consumption.

Comes with fittings 10MM and 13MM

Fiamma Expansion Tank Features

For types of pressure switch pumps. Shurflo etc
The tank eliminates the pulsating operation of pressure switch pumps and supplies a constant flow of water in the required quantity.
Extends the life of the pump and boiler as well as cutting water consumption.
The internal pressurised diaphragm provides a smooth, surge-free flow.
Can be adapted to all pressure switch pumps on the market

Frequently Asked Questions

What does the Fiamma A20 Expansion Tank do?

The Fiamma A20 is an accumulator tank that absorbs the pressure spikes created when a 12v diaphragm water pump cycles on and off. It uses an internal pressurised diaphragm to convert pulsating water flow into a smooth, consistent stream at even pressure. This stops taps from surging, reduces pipework rattle, and prevents fluctuating shower temperatures caused by rapid pump cycling.

Which water pumps is the Fiamma A20 compatible with?

The A20 is a universal accumulator tank compatible with all pressure switch diaphragm pumps used in caravans, motorhomes, campervans and boats. This includes Fiamma Aqua 8, Shurflo Trail King, Flojet, Whale and all other brands of 12v pressure switch pump. It comes pre-charged at 0.9 bar for Fiamma pumps with a 1.5 bar pressure switch, and the pressure is adjustable for other pump brands.

Where should the Fiamma A20 be installed in the water system?

Fiamma's installation manual states the A20 should be fitted within the first metre of pressurised pipework, downstream of the water pump and before the taps. It installs inline on the pressure side of the system. The tank can be mounted in any position, though Fiamma recommend positioning it with the pre-charge valve facing upward, as this makes it easier to check the pressure and drain the water during servicing.

What fittings are supplied with the Fiamma A20?

The A20 comes with straight and angled 13mm barbed hose connectors for flexible pipe, plus self-tapping screws for mounting. If your caravan or motorhome uses 12mm semi-rigid push-fit pipe rather than flexible hose, you will need two 1/2 inch BSP female to 12mm push-fit adaptors to connect the tank. These adaptors screw onto the A20's ports in place of the barbed fittings.

How do I adjust the pre-charge pressure on the Fiamma A20?

The A20 has a valve that accepts a standard air compressor or foot pump. It arrives pre-charged at 0.9 bar (13 psi), which is the correct setting for Fiamma pumps with a 1.5 bar pressure switch. For other pump brands, Fiamma recommend setting the pre-charge to match the start pressure of your pump, up to a maximum of 3 bar. You should check the pre-charge value once a year and before initial installation.

What are the dimensions and weight of the Fiamma A20?

The Fiamma A20 measures 234 x 154 x 98mm with its socket fittings attached (body dimensions are 234 x 110 x 98mm). It weighs approximately 300g. The outlet diameter is 12mm. It's a compact unit, roughly the size of a 750ml bottle of water, making it straightforward to fit into the limited space around most caravan and motorhome water pump installations.

Does the Fiamma A20 need winterising?

Yes. Fiamma's installation instructions state that if outdoor temperatures are expected to fall below 0 degrees Celsius during winter storage, you must drain the entire plumbing system including the A20 expansion tank. Water left inside the tank in freezing conditions could damage the internal diaphragm and the tank body.

Can the diaphragm inside the Fiamma A20 be replaced?

Yes. The A20 is designed to be fully dismantled for diaphragm inspection and servicing. If the diaphragm becomes worn or damaged over time, it can be accessed by separating the two halves of the tank body. This is a straightforward maintenance task that doesn't require specialist tools.

by Amazon Customer (17 Feb 2019)

by Caravaner (22 Aug 2013)

(5/5)

The Fiamma expansion tank does what it says on the tin - it has worked perfectly to solve the anoyance of a noisy pump.

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Instructions

Fiamma A20 Expansion Tank Installation Instructions

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Returning an Item

If you’ve changed your mind about keeping your purchase, please return it in its original condition with proof of purchase and we’ll exchange or refund it. Unless faulty, this should be within 100 days of receiving your order. By original condition, we’d expect this to mean that you’ve kept packaging and labels, and that the item is undamaged and unused.

For further information of how to return your item, please visit the "Returning an Unwanted/Faulty/Damaged Item" section on our Help Page.

Did you know we have been established and have been in the caravan and motorhome industry for over 50 years?