--- product_id: 55544533 title: "Honeywell Automatic Bypass and Differential Pressure Valve" brand: "honeywell" price: "603 zΕ‚" currency: PLN in_stock: true reviews_count: 3 url: https://www.desertcart.pl/products/55544533-honeywell-automatic-bypass-and-differential-pressure-valve store_origin: PL region: Poland --- # 0.1-0.6 bar wide differential range 22mm compression fittings 50L/min high flow rate Honeywell Automatic Bypass and Differential Pressure Valve **Brand:** honeywell **Price:** 603 zΕ‚ **Availability:** βœ… In Stock ## Summary > πŸ”₯ Keep your boiler flowing flawlessly with Honeywell’s smart bypass valve! ## Quick Answers - **What is this?** Honeywell Automatic Bypass and Differential Pressure Valve by honeywell - **How much does it cost?** 603 zΕ‚ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/55544533-honeywell-automatic-bypass-and-differential-pressure-valve) ## Best For - honeywell enthusiasts ## Why This Product - Trusted honeywell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Robust High-Flow Capacity:** Handles up to 50 liters per minute with ease - β€’ **Quick & Clean Installation:** Standard 22mm compression fittings for seamless setup - β€’ **Optimized Energy Efficiency:** Automatically regulates bypass flow to save energy - β€’ **Effortless Precision Adjustment:** Unique, simple mechanism for hassle-free tuning - β€’ **Wide Pressure Range Compatibility:** Operates smoothly between 0.1 and 0.6 bar differential pressure ## Overview The Honeywell DU145 Automatic Bypass and Differential Pressure Valve is a brass, 22mm compression-fitted valve designed to maintain constant boiler flow by automatically regulating water bypass. It supports a high flow rate of 50L/min and operates within a differential pressure range of 0.1 to 0.6 bar, ensuring energy-efficient heating system performance and compliance with UK building regulations. ## Description Product Description The DU145 Automatic Bypass Valve controls flow of water through a bypass circuit which is installed between flow and return pipework, typically at or near the boiler. Building Regulation advice states that if a bypass is installed, an Automatic Bypass Valve must be fitted. The DU145 saves energy by only allowing flow through the bypass when needed i.e. when flow through the system is reduced when zone valves or radiator thermostats are closing. The use of an ABV is recommended by the UK government as Best Practice in the CHeSS (Central Heating System Specifications) guide to central heating systems. Box Contains 1 x DU145-3/4B Auto Bypass Valve Review: Perfect - Excelent πŸ‘ 101%πŸ‘ Review: Very disappointed - probably going to return - Very disappointed. Firstly it looks very easy for the internal plunger to settle out of alignment and allow permanent leakage/bypass. The biggest problem is that both the adjustment cap and the part with the graduated scale are both free to move independently - turning the adjustment knob also turns the graduated scale so the cap arrow points to 2 all the time. Probably about to return. ## Features - Unique and simple adjustment mechanism - High flow-50l per minute - Wide differential range 0 1-0 6 bar - 22mm Compression for ease of Install - Ensures constant flow through boiler ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B006BWJS9K | | Best Sellers Rank | 634,440 in DIY & Tools ( See Top 100 in DIY & Tools ) 787 in Tap & Valve Washers | | Brand | Honeywell | | Customer Reviews | 4.1 4.1 out of 5 stars (5) | | Exterior Finish | Gold | | Global Trade Identification Number | 04019837022778 | | Included Components | 1 x Honeywell Automatic Bypass and Differential Pressure Valve | | Inlet Connection Size | 22 Millimeters | | Inlet Connection Type | Compression | | Item Dimensions | 7 x 11.5 x 4 centimetres | | Item Type Name | Automatic Bypass Valve | | Manufacturer | Honeywell | | Material | Brass | | Maximum Pressure | 6 Bars | | Model Number | DU145-3/4B | | Outlet Connection Type | Compression | | Unit Count | 1.0 count | | Valve Type | automatic bypass,automatic bypass valve | ## Product Details - **Brand:** Honeywell - **Exterior finish:** Gold - **Global Trade Identification Number:** 04019837022778 - **Inlet connection size:** 22 Millimeters - **Inlet connection type:** Compression - **Item dimensions L x W x H:** 7 x 11.5 x 4 centimetres - **Manufacturer:** Honeywell - **Material:** Brass - **Maximum operating pressure:** 6 Bars - **Outlet connection type:** Compression ## Images ![Honeywell Automatic Bypass and Differential Pressure Valve - Image 1](https://m.media-amazon.com/images/I/514A1Pxq0xS.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect *by K***G on 21 March 2020* Excelent πŸ‘ 101%πŸ‘ ### ⭐ Very disappointed - probably going to return *by D***E on 1 June 2016* Very disappointed. Firstly it looks very easy for the internal plunger to settle out of alignment and allow permanent leakage/bypass. The biggest problem is that both the adjustment cap and the part with the graduated scale are both free to move independently - turning the adjustment knob also turns the graduated scale so the cap arrow points to 2 all the time. Probably about to return. ### ⭐ Poor design *by A***R on 10 March 2017* Dial with numbers on should be fixed to the body of the valve and the red knob should rotate around it. In the version I received the two rotated together making it useless. Returned to Amazon and I'm now trying an alternative manufacturer. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/55544533-honeywell-automatic-bypass-and-differential-pressure-valve](https://www.desertcart.pl/products/55544533-honeywell-automatic-bypass-and-differential-pressure-valve) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-25*