Is it best practice to have a manifold per floor for water-based UFH?

Short answer: yes, in most cases a manifold per floor is best practice, especially in multi-storey properties.

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Why installers usually go with one manifold per floor

1. Better temperature control (zoning)

Each floor has different heating needs:

• Ground floors lose heat to the ground
• Upper floors retain more heat
• Lofts and basements behave very differently

A manifold per floor lets you:

• Control each floor independently
• Set different temperatures and schedules
• Avoid overheating upstairs while trying to warm downstairs

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2. Easier system balancing

Underfloor heating relies on balanced flow through each loop. With a manifold per floor:

• Pipe runs are shorter and more consistent
• Flow rates are easier to adjust
• Less risk of some rooms not heating properly

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3. Shorter pipe runs = better efficiency

If you try to serve multiple floors from one manifold:

• Some loops become very long
• You may need a larger pump
• Heat losses increase in the distribution pipework

Keeping manifolds local to each floor keeps things efficient.

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4. Simpler installation and maintenance

• Easier to install in stages (floor by floor)
• Faults can be isolated to one floor
• More accessible if placed in cupboards on each level

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When a single manifold might be acceptable

You might get away with one manifold if:

• The property is small (e.g. compact 2-storey)
• Total floor area is relatively low
• Pipe runs can all be kept within recommended lengths (~80–100m per loop)
• Heat loads across floors are similar

Even then, many installers still prefer splitting by floor.

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Typical “good practice” layout

• One manifold per floor
• Located centrally on that floor (cupboard, utility space, etc.)
• Each room has its own loop (or multiple loops for larger rooms)
• Controlled via individual room thermostats and actuators

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Rule of thumb

Go with a manifold per floor if:

• You have 2+ storeys
• Total area is over ~100 m²
• Different floors are used differently (e.g. bedrooms vs living areas)
• You want proper zoning and energy efficiency

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Bottom line

It’s not a strict requirement, but a manifold per floor is the preferred approach because it gives you:

• better control
• better efficiency
• easier installation and commissioning
• fewer headaches long term