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This is the #1 reason for **low shower pressure from roof tank** - and fix costs just 1 extra pipe!
**LEFT - WRONG - No Vent Pipe = Slow Flow ❌**
Tank on roof, pipe goes directly down to shower. No air entry.
What happens:
- Water tries to go down, but air gets trapped inside pipe - like putting finger on top of a straw, water won’t fall.
- Pipe creates air lock / vacuum. Water has to fight air to come out.
- Result: Weak, slow shower, even though tank is full.
**RIGHT - CORRECT - Extra Vent Pipe = Strong Flow ✅**
One extra vertical pipe added, higher than tank top, open to air. See labels:
- **Extra Vent Pipe** - Connects to main down pipe
- **Air Escape** - Blue arrows UP from tank and vent
How it fixes:
- When water goes down to shower, air from this vent pipe goes IN behind water, pushing it down.
- No air lock. Water flows freely with gravity.
- Also, air trapped in tank escapes through small pipe on tank top.
Result: Same tank, same height, but **3x stronger flow**.
**Installation Rules:**
1. Vent pipe diameter = same as main pipe (1 inch)
2. Vent height = 1 foot higher than tank lid
3. Top of vent = open, with U-bend to stop dust/birds
4. Connect vent as close to tank down-takeoff as possible
Cost: 10 feet pipe + elbow = very cheap, but shower feels like pressure pump!
Try this before buying a pump motor.
#plumbing #waterpressure #watertank
**LEFT - WRONG - No Vent Pipe = Slow Flow ❌**
Tank on roof, pipe goes directly down to shower. No air entry.
What happens:
- Water tries to go down, but air gets trapped inside pipe - like putting finger on top of a straw, water won’t fall.
- Pipe creates air lock / vacuum. Water has to fight air to come out.
- Result: Weak, slow shower, even though tank is full.
**RIGHT - CORRECT - Extra Vent Pipe = Strong Flow ✅**
One extra vertical pipe added, higher than tank top, open to air. See labels:
- **Extra Vent Pipe** - Connects to main down pipe
- **Air Escape** - Blue arrows UP from tank and vent
How it fixes:
- When water goes down to shower, air from this vent pipe goes IN behind water, pushing it down.
- No air lock. Water flows freely with gravity.
- Also, air trapped in tank escapes through small pipe on tank top.
Result: Same tank, same height, but **3x stronger flow**.
**Installation Rules:**
1. Vent pipe diameter = same as main pipe (1 inch)
2. Vent height = 1 foot higher than tank lid
3. Top of vent = open, with U-bend to stop dust/birds
4. Connect vent as close to tank down-takeoff as possible
Cost: 10 feet pipe + elbow = very cheap, but shower feels like pressure pump!
Try this before buying a pump motor.
#plumbing #waterpressure #watertank
This is the #1 reason for **low shower pressure from roof tank** - and fix costs just 1 extra pipe!
**LEFT - WRONG - No Vent Pipe = Slow Flow ❌**
Tank on roof, pipe goes directly down to shower. No air entry.
What happens:
- Water tries to go down, but air gets trapped inside pipe - like putting finger on top of a straw, water won’t fall.
- Pipe creates air lock / vacuum. Water has to fight air to come out.
- Result: Weak, slow shower, even though tank is full.
**RIGHT - CORRECT - Extra Vent Pipe = Strong Flow ✅**
One extra vertical pipe added, higher than tank top, open to air. See labels:
- **Extra Vent Pipe** - Connects to main down pipe
- **Air Escape** - Blue arrows UP from tank and vent
How it fixes:
- When water goes down to shower, air from this vent pipe goes IN behind water, pushing it down.
- No air lock. Water flows freely with gravity.
- Also, air trapped in tank escapes through small pipe on tank top.
Result: Same tank, same height, but **3x stronger flow**.
**Installation Rules:**
1. Vent pipe diameter = same as main pipe (1 inch)
2. Vent height = 1 foot higher than tank lid
3. Top of vent = open, with U-bend to stop dust/birds
4. Connect vent as close to tank down-takeoff as possible
Cost: 10 feet pipe + elbow = very cheap, but shower feels like pressure pump!
Try this before buying a pump motor.
#plumbing #waterpressure #watertank
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