Expansion Tank and Air Separator Supplier for Metro Manila Buildings

An expansion tank and an air separator solve two different problems in the same closed hydronic or hot water loop. As water heats and cools, it expands and contracts. A diaphragm or bladder expansion tank absorbs that volume change so system pressure stays within a safe operating band instead of triggering relief valves or stressing pipe joints. An air separator does a different job: it pulls entrained and dissolved air out of the circulating water so pumps do not lose prime, heat exchangers do not air-lock, and radiators or coils do not develop air pockets that reduce heat transfer.

Most commercial buildings in Metro Manila, condominiums, hotels, and hospitals with closed-loop heating or chilled water systems need both components installed together, typically near the pump room. JOHOB Hardware Trading supplies both as part of its pumping and pressure systems line, sourced from ISO 9001 certified partner factories and TUV SUD tested before they ship. Sizing each component correctly against your system's loop volume, operating temperature, and pump curve is what determines whether the installation actually solves the air and expansion problems it is meant to solve, which is why we ask for system specifications before quoting rather than quoting off a generic catalog size.

Expansion tanks and air separators are frequently specified as separate line items by different contractors, which is where sizing mismatches happen. An expansion tank sized correctly for a building's water volume can still fail to control pressure swings if the air separator upstream is undersized or missing, because trapped air changes the effective compressibility of the loop. This is a common gap on Metro Manila retrofit projects where an existing hydronic system is being expanded or where a boiler or chiller is being replaced without re-checking the pressure and air management components around it.

JOHOB's buying guides for pumping and pressure equipment are written against Philippine plumbing code requirements, NSPC and NBC, rather than generic manufacturer catalogs, so the sizing questions we ask when you request a quote, loop volume, maximum operating temperature, pump shutoff head, and pipe run length, map to what a mechanical engineer or plumbing inspector will actually check during permitting and commissioning. We recommend treating the expansion tank and air separator as one sizing exercise, not two separate purchase decisions, and sharing your system schematic at RFQ stage so both components are matched to the same operating conditions.

Before requesting a quote for an expansion tank and air separator package, confirm the following with your mechanical engineer or contractor: system type (closed-loop hydronic heating, chilled water, or domestic hot water), total loop volume in liters, minimum and maximum operating temperature, system fill pressure and pump shutoff head, and available mounting space near the pump room or mechanical room. For the air separator specifically, confirm pipe size at the point of installation and expected flow rate, since air separators are sized to flow rate and pipe diameter rather than to tank volume the way expansion tanks are.

If the installation is a retrofit rather than new construction, also confirm the age and condition of any existing expansion tank or air separator already on site, since a system that previously ran without proper air separation may have corrosion or scale inside pipe runs that affects replacement sizing. Share this information when you submit your RFQ and we respond within 1 business day with sizing recommendations and a firm lead time, which runs 21 to 35 days ex-stock for standard sizes or 45 to 90 days for made-to-order configurations.

Expansion tanks and air separators supplied by JOHOB come from ISO 9001 certified partner factories and are TUV SUD tested before shipment. Pressure vessel components reference ASME standards where applicable, and CE marking applies to the electrical components on associated pump control panels. Potable water contact panels used in connected pressure tank systems are WRAS-certified. Certification documentation is provided on request, which matters for projects that need to show compliance during permitting or building turnover.

On pricing, we do not publish prices for this equipment because sizing changes the specification significantly from one building to the next. What we can confirm upfront is the tax treatment: quotes to VAT-registered buyers include the standard 12 percent VAT, while buyers registered with PEZA or SBMA, and exporters, qualify for zero-VAT treatment on the same equipment. Standard lead time is 21 to 35 days ex-stock for sizes our partner factories carry, extending to 45 to 90 days for made-to-order configurations. We respond to every RFQ within 1 business day, typically with sizing clarification questions before we issue a firm quotation and lead time.

JOHOB delivers expansion tanks, air separators, and related pumping and pressure equipment nationwide across the Philippines. Coverage includes Metro Manila and the rest of Luzon, Visayas, and Mindanao, as well as PEZA and SBMA economic zones and Clark. If your site sits inside an economic zone, flag this when you submit your RFQ so we can apply zero-VAT documentation and route delivery through the applicable zone process rather than standard domestic delivery.

For buildings in Metro Manila specifically, this means a hotel, hospital, condominium, or commercial building project can source both the expansion tank and the air separator from one supplier, with one RFQ response window and one delivery schedule, instead of coordinating two separate vendors on two separate lead times. After-sales support and warranty handling run through the same JOHOB point of contact that issued the original quote, which keeps the paper trail simple if a component needs service or replacement parts later in the building's operating life.

An expansion tank and air separator rarely operate alone. Most Metro Manila commercial and institutional buildings pair them with a hydropneumatic pressure tank to maintain consistent water pressure across floors, and with a VFD duplex control panel to manage booster or transfer pump staging without pressure spikes. JOHOB supplies all of these as part of one pumping and pressure systems line, which is useful when a building's mechanical contractor is specifying an entire pump room rather than one component at a time.

If you are sizing a full pump room retrofit or new installation, our pressure tank sizing calculator and hydropneumatic tank guides cover the pressure-tank side of the same system these expansion tanks and air separators connect to. Reviewing those alongside this page gives a fuller picture of how the pressure, expansion, and air management components in a closed or semi-closed water system are meant to work together, before you finalize a bill of materials for quotation.

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