ABST PEX Manifold 2 Loop Stainless Steel Floor Radiant Heat Manifold

Our review of the ABST PEX Manifold finds it best suited to homeowners or installers seeking a compact, reliable two-loop hydronic manifold for radiant floor heating. The biggest reason to buy is its use of 304 stainless steel and a pre-assembled, pressure-tested layout that simplifies installation while resisting corrosion and wear. For a straightforward in-wall or box-mounted manifold with integrated flow metering, automatic exhaust and drain, and 1/2' adapters included, this kit delivers practical value without unnecessary extras.

Key Features

• 304 stainless steel construction: Provides corrosion resistance and better thermal conductivity so the manifold transmits heat effectively and lasts under pressure.
• Two loop capacity: Supports a simple two-circuit radiant floor layout for small zones or individual rooms, keeping piping neat and centralized.
• Pre-assembled and pressure tested: Comes assembled with valves and fittings to reduce setup time and give installers confidence during commissioning.
• Integrated flow meters and valves: Up to 1.4 GPM meters and supply/return shut-off ball valves allow precise flow balancing and isolation for maintenance.
• Auto exhaust and drain: Built-in automatic air exhaust and drain valves help remove trapped gas and speed up system fill and bleeding for improved performance.
• Mounting bracket and adapters included: Stainless steel bracket and four 1/2' adapters are supplied to secure the manifold and connect common PEX sizes without hunting for extra parts.

Who It's For

This manifold is aimed at DIYers with basic plumbing skills and professional installers working on small hydronic radiant projects. Its pre-assembled format and included accessories suit those who want a compact, wall- or box-mounted distributor that minimizes extra fittings and installation time.

It is less appropriate for large multi-zone systems that require more than two loops or specialized manifolds with electronic actuators and advanced hydraulic balancing. Buyers needing integrated electronic controls or more than two circuits should look at larger commercial manifolds.

Pros & Cons

Pros

• Durable 304 stainless steel body offers strong corrosion and wear resistance for long service life.
• Pre-assembled, pressure tested kit with mounting bracket speeds installation and reduces parts hunting on site.
• Integrated flow meters and shut-off valves provide straightforward flow control and isolation for maintenance.
• Automatic exhaust and drain valves improve system bleeding and reduce trapped air issues.

Cons

• Some users noted potential input connection sealability issues, so careful fitting of supply connections is important.
• Only two loops included, so it is not suited to larger multi-zone installations without additional manifolds.

Specifications

Loops	2
Material	304 stainless steel
Supply/Return Valves	1' NPT shut-off ball valves
Flow Meter Capacity	Up to 1.4 GPM
Adapters Included	Four 1/2' adapters
Accessories	Auto exhaust & drain valve, temperature gauge, mounting bracket

Our Verdict

The ABST PEX two-loop stainless steel manifold is a sensible, value-minded choice for small radiant floor projects thanks to its durable 304 stainless construction, included flow meters and valves, and pre-assembled, pressure-tested delivery. Installers and homeowners who need a compact, serviceable distributor with bleed and drain features will appreciate its combination of reliability and convenience.

Frequently Asked Questions

Does this kit include adapters for PEX connections?
Yes, the kit includes four 1/2' adapters to match common PEX connection sizes.

Is the manifold ready to install out of the box?
Yes, it is pre-assembled, pressure tested and comes with a stainless steel mounting bracket for wall or box installation.

Can it handle air in the system?
It includes automatic exhaust and drain valves designed to remove trapped gas and improve flow during filling and operation.