Macerator or Gravity Waste for a New Bathroom
A macerator pumps waste through small-bore pipework where gravity drainage isn't possible; a standard gravity waste relies on a proper fall to the existing soil pipe.
A macerator pumps waste through small-bore pipework where gravity drainage isn't possible; a standard gravity waste relies on a proper fall to the existing soil pipe. The choice depends entirely on where the new bathroom sits.
The case for gravity waste
Wherever a sensible fall to the existing soil stack is achievable, standard gravity drainage is simpler, quieter and has fewer moving parts to maintain.
The case for a macerator
Basement conversions, or a WC positioned well below or far from the existing soil stack, often can't achieve gravity fall at all, making a macerator the only practical route.
Which wins when
Always check whether gravity drainage is achievable first — it's the simpler, more reliable option wherever the layout allows it. A macerator is a solution for when gravity genuinely isn't possible.
Get your new bathroom drainage assessed
Tell us where the new bathroom will sit relative to your existing soil pipe and we'll confirm which waste route is realistic.
Questions we get asked
Are macerators reliable?
Modern units are generally reliable when sized correctly and not overloaded, but they do have a motor and blades that are mechanical parts subject to wear, unlike gravity pipework.
Can a macerator serve a whole bathroom?
Yes, most are rated for a full suite including WC, basin and shower, provided the unit is sized for that load.
Is gravity waste always better if it's possible?
In terms of simplicity and long-term reliability, yes — we'd always recommend it over a macerator wherever the fall genuinely allows it.