♨️ Koller Compact Series Jet Pump – 0.45kW Single Speed

Ultra-compact design for space-restricted whirlpool bath installations

💧 Product Overview

The Koller Compact Series Jet Pump (0.45kW) is the entry-level model in the Koller Compact range, specifically engineered for installations where space is extremely limited. With its ultra-compact dimensions and compact wet ends, this pump is ideal for fitting into the tightest spaces with little or no plumbing alterations required.

Delivering 0.45kW of power output, this single-speed pump is suitable for use as either a circulation pump or a boost pump on jet circuits with 6–8 jets. Commonly used in whirlpool baths, this model is also found in some European and Chinese hot tubs where space constraints demand the most compact solution available.

The self-drain wet end ensures efficient drainage via the bottom inlet, directing water back into the bath and down the plug hole when not in use. The A-Profile mount system integrates with Koller Quick Fix Vario supports for secure, straightforward installation.

✨ Key Features

• ✅ Ultra-Compact Design – Smallest in the Compact series for extremely tight spaces
• ✅ Motor Power: 0.45kW – Efficient output for smaller whirlpool baths
• ✅ Power Input (P1): 0.45kW – Energy-efficient operation
• ✅ Single-Speed Operation – Consistent, reliable performance
• ✅ Self-Drain Wet End – Water drains automatically, preventing stagnation
• ✅ 6–8 Jet Capacity – Suitable for small to medium whirlpool bath systems
• ✅ 1.5″ Male Buttress Threads – Industry-standard 63mm OD connections
• ✅ A-Profile Mount System – Compatible with Koller Quick Fix Vario supports
• ✅ Compact Dimensions – 300mm length, 179mm height
• ✅ No Spare Parts Required – Simple replacement when needed
• ✅ Direct Replacement – Replaces models 3611KEP and 240-0059P

🔧 Technical Specifications

Specification	Value
Brand	Koller
Series	Compact
Pump Type	Circulation / Jet
Motor Power (Output)	0.45 kW
Power Input (P1)	0.45 kW
Horsepower Range	0.05–0.5 HP
Speed Settings	Single Speed
Wet End Type	Self-Drain
Jet Capacity	6–8 jets
Connection Size	1.5″ Male Buttress Thread
Connection Diameter	63 mm (OD)
Thread Type	Male Buttress
Mount System	A-Profile (Quick Fix Vario compatible)
Length	300 mm
Height	179 mm
Spare Parts Available	No
Replaces Models	3611KEP, 240-0059P
MPN	3611 WEP-2
SKU	PMP-7898

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	220–240V
Frequency	50 Hz
Phase	Single Phase
Power Input (P1)	0.45 kW
Connection Type	Bare Wire

⚠️ IMPORTANT ELECTRICAL SAFETY NOTICE:

All electrical work must be carried out by a qualified electrician in accordance with UK wiring regulations (BS 7671). Hot tub and whirlpool bath installations require RCD protection (30mA) for safety. The bare wire connection requires proper termination by a qualified professional. Never attempt electrical connections yourself unless you are a qualified professional.

🔄 Compatibility Guide

Koller Compact Series Comparison

Model	Power	Mount	Length	Jet Capacity
Compact 0.45kW	0.45 kW	A-Profile	300mm	6–8 jets
Compact 0.55kW	0.55 kW	C-Profile	300mm	6–8 jets

Connection Sizing

The Koller Compact uses industry-standard 1.5″ connections. Hot tub industry terminology differs from actual measured dimensions:

Industry Term	Actual Outside Diameter
1.5″ Connection	Approximately 63 mm
2.0″ Connection	Approximately 79 mm
2.5″ Connection	Approximately 92 mm

💡 Tip: Always measure your existing connections carefully before ordering.

This Pump Features:

• 📍 Wet End Type: Self-Drain (Compact)
• 📍 Thread Type: Male Buttress
• 📍 Connection Size: 1.5″ / 63mm OD
• 📍 Mount System: A-Profile
• 📍 Length: 300mm
• 📍 Height: 179mm

Self-Drain Operation

Self-drain pumps draw water via the inlet situated at the bottom of the wet end front face. When the pump is switched off, water drains back through this connection, returning to the bath and down the plug hole. This design:

• ✅ Prevents standing water in the pump
• ✅ Reduces risk of bacterial growth
• ✅ Extends pump and seal life
• ✅ Simplifies maintenance

Compatible Applications:

This pump is commonly found in:

• Whirlpool baths with very limited installation space
• Smaller European-manufactured whirlpool systems
• Chinese hot tub and whirlpool bath imports
• Replacements for Koller 3611KEP models
• Replacements for 240-0059P models

Note: Unions are sold separately. Ensure compatibility with your existing plumbing configuration before purchase.

🛠️ Installation Requirements

Mounting

Requirement	Specification
Mount System	A-Profile
Compatible Support	Koller Quick Fix Vario
Pump Length	300 mm
Pump Height	179 mm
Base	Solid, level, vibration-dampening surface
Access	Allow adequate clearance for maintenance

Plumbing Connections

Connection	Size
Inlet	1.5″ / 63mm OD Male Buttress Thread
Outlet	1.5″ / 63mm OD Male Buttress Thread
Unions	Sold separately

Electrical Connection

Requirement	Specification
Connection Type	Bare Wire
Voltage	220–240V / 50Hz
Installation	By qualified electrician only

Installation Notes:

⚠️ Installation must be carried out by a competent individual or tradesperson trained within the industry

⚠️ Never run the pump dry – this will cause seal damage

⚠️ Ensure proper electrical bonding to earth as per BS 7671

⚠️ Unions sold separately – ensure compatible unions are ordered

⚠️ This pump replaces models 3611KEP and 240-0059P – check compatibility before ordering

⚠️ Little or no plumbing alterations usually required when replacing like-for-like

🔩 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal area and union connections
Inspect unions	Monthly	Tighten if necessary to prevent water loss
Listen for unusual noise	Weekly	Normal operation should be quiet
Check motor ventilation	Quarterly	Keep air vents clear of debris
Visual inspection	Monthly	Look for signs of wear or damage

Self-Drain System Care

The self-drain feature significantly reduces maintenance requirements:

• Ensure drain pathways remain clear and unobstructed
• Check that water drains completely after each use
• Inspect the inlet area periodically for debris buildup

Warning Signs – Consider Replacement If:

• ❌ Unusual grinding or screeching noises
• ❌ Water leaking from the seal area
• ❌ Motor trips the circuit breaker repeatedly
• ❌ Noticeably reduced water flow
• ❌ Motor overheating during operation
• ❌ Excessive vibration
• ❌ Pump fails to start

🛁 Ideal Applications

Application	Suitability	Notes
♨️ Small Whirlpool Bath (6–8 jets)	✅ Excellent	Primary intended use
♨️ Ultra-Tight Installations	✅ Excellent	Smallest Compact model
♨️ Circulation Pump	✅ Good	Suitable for circulation duties
♨️ Jet Boost Pump	✅ Good	Additional power for jet circuits
🛁 3611KEP Replacement	✅ Excellent	Direct replacement model
🛁 240-0059P Replacement	✅ Excellent	Direct replacement model
♨️ Larger Systems (9+ jets)	⚠️ Upgrade needed	Consider 0.55kW or higher

Perfect For:

• Residential whirlpool baths with extremely limited space
• Installations where even the 0.55kW Compact won’t fit
• Budget-conscious replacements for smaller systems
• European-manufactured compact whirlpool systems
• Replacement for existing Koller 3611KEP pumps
• Replacement for 240-0059P model pumps

❓ Frequently Asked Questions

Q: What is the difference between this 0.45kW and the 0.55kW Compact? A: Both have 300mm length, but the 0.45kW has less power output (0.45kW vs 0.55kW/0.74HP) and uses A-Profile mounting versus C-Profile on the 0.55kW. The 0.45kW is the most economical option for smaller whirlpool baths.

Q: What power output does this pump have? A: The Koller Compact 0.45kW has a motor power output of 0.45kW with a horsepower range of 0.05–0.5 HP.

Q: How many jets can this pump support? A: This pump is suitable for whirlpool baths with 6–8 jets.

Q: Will this pump fit my whirlpool bath? A: This pump uses 1.5″ male buttress thread connections (63mm OD) with self-drain configuration and Koller A-Profile mounting system. At 300mm length and 179mm height, it’s designed for the tightest spaces. Measure your existing pump’s connections and available space to confirm compatibility.

Q: Does this pump replace older models? A: Yes, this pump (3611 WEP-2) directly replaces both the 3611KEP and 240-0059P models.

Q: What voltage does this pump require? A: The pump operates on 220–240V at 50Hz (UK standard). The pump comes with bare wire connections requiring professional termination by a qualified electrician.

Q: Is this pump single-speed or dual-speed? A: This is a single-speed pump for consistent, reliable operation.

Q: What size are the ports? A: Both inlet and outlet are 1.5″ male buttress threads with an outside diameter of approximately 63mm.

Q: Are unions included? A: No, unions are sold separately. Ensure you order compatible unions for your plumbing configuration.

Q: Can spare parts be purchased separately? A: No, spare parts are not currently available for this pump series. If service is required, replacement of the complete unit is recommended.

Q: How do I know if my pump needs replacing? A: Signs include unusual noises (grinding, screeching), water leaking from the seal, reduced water flow, motor tripping the breaker repeatedly, or failure to start.

🏆 Why Choose the Koller Compact 0.45kW Pump

• ✅ Most Compact Option – Ultra-small dimensions for the tightest installations
• ✅ Cost-Effective – Entry-level pricing for budget-conscious buyers
• ✅ Proven Reliability – Widely used across UK whirlpool bath installations
• ✅ Quiet Operation – Designed for smooth, silent running
• ✅ Self-Drain Technology – Prevents water stagnation and extends pump life
• ✅ Easy Installation – A-Profile mount system, usually no plumbing changes needed
• ✅ UK Electrical Compatibility – 220–240V / 50Hz supply
• ✅ Direct Replacement – Seamless upgrade from 3611KEP and 240-0059P models

🤝 Why Buy From Parts4Tubs

• ✅ UK-Based Company – Local support and fast domestic delivery
• ✅ Expert Advice – Knowledgeable team ready to assist with compatibility questions
• ✅ Fast UK Delivery – Get your replacement pump quickly to minimise downtime
• ✅ Competitive Pricing – Great value on genuine spa and whirlpool parts
• ✅ Full Warranty Support – Peace of mind with manufacturer-backed warranties
• ✅ Easy Returns – Hassle-free returns policy within 30 days
• ✅ Quality Parts Guarantee – Only genuine, high-quality components

✨ Summary

The Koller Compact Series Jet Pump (0.45kW) is an ultra-compact, entry-level single-speed pump designed for whirlpool baths with 6–8 jets where installation space is extremely limited. With 0.45kW output power, self-drain wet end, and industry-standard 1.5″ male buttress connections (63mm OD), this pump delivers reliable performance in a compact 300mm × 179mm package. Operating on 220–240V / 50Hz UK supply with bare wire connection and A-Profile mounting, it’s the most economical choice for tight spaces and directly replaces the older 3611KEP and 240-0059P models.