Heating & Hot Water

The Honeywell Home L641A1039 Cylinder Thermostat is a robust, surface‑mounted unit designed for hot water cylinders. Compatible with uninsulated or foam‑lagged tanks, it offers simple dial adjustment, easy mounting with included straps/hooks and reliable switching of boilers, pumps or zone valves.

The Honeywell Home DU145‑3/4B 22 mm Differential Bypass Valve ensures consistent boiler flow and stable system pressure by automatically regulating differential pressure in heating circuits. With 22 mm compression connections, a wide differential pressure range (0.1‑0.6 bar) and high flow capacity, it is ideal for modern central heating systems requiring reliable bypass control.

The Honeywell Home DU144 22 mm Straight Auto Bypass Valve (DU144A1001) is a robust automatic bypass valve designed to ensure minimum boiler flow, maintain pressure balance and reduce noise in closed‑loop heating systems. With 22mm compression fittings, wide differential pressure range (0.1–0.6 bar) and brass construction, it offers a professional solution for energy‑efficient central heating installations.

The Honeywell Home DT40WT20 Wired Room Thermostat is a white‑finish, wall‑mounted thermostat offering simple on/off control for domestic heating systems, compatible with 24‑230 V boilers and heat pumps. Its slim profile, easy‑read LED display and built‑in eco mode make it a reliable choice for both traditional and modern UK homes.

The Honeywell Home Actuator for V4043H (40003916‑001/U) is a genuine replacement powerhead designed to fit the V4043H series two‑port motorised zone valves. Compatible with UK 230 V systems, it features a manual lever, spring‑return mechanism and quick‑swap fitment without full system drainage — ideal for fast, professional repairs.

The Honeywell Home 2 Port Zone Valve 28 mm V4043H1106/U is a precision‑engineered motorised valve designed for domestic and light commercial heating systems. With a 28 mm compression connection, spring‑return action, auxiliary end switch to control boiler or pump circuits, and minimal power consumption for quieter operation, it’s the ideal upgrade to enhance system efficiency.

The Honeywell Home 22 mm 3‑Port Diverter Valve (V4044C1288/U) is a high‑quality motorised valve designed for domestic fully‑pumped central heating systems. Its 22 mm compression connections, two‑position operation and spring‑return mechanism allow seamless switching between heating and hot‑water services for enhanced system flexibility and reliability.

The Honeywell Home 10‑Way Junction Box (42002116‑002) is a robust ABS wiring centre designed for UK heating system installations. With ten clearly numbered terminals, accommodation for up to 15 A and 12 knock‑out entries for cable routing, this universal junction box ensures clean, safe S‑Plan and Y‑Plan wiring setups.

*DISCONTINUED - New model - Honeywell DT4 Room Thermostat Wired On/Off White DT40WT20*

The Honeywell DT90 Digital Stat DT90E1012 offers advanced temperature control for your heating system with its energy-efficient, easy-to-use digital interface. Designed for both residential and commercial applications, this thermostat provides precise and reliable temperature management to enhance comfort and save energy.

The Honeywell CM707 Programmable Room Stat 7 day is an easy-to-use programmable thermostat that allows you to set different temperatures for different times of the day and days of the week. This can help you to save energy and money on your heating bills. The CM707 is also compatible with most boilers and heating systems.