{"product_id":"eph-cp4-rf-programmable-thermostat-pack","title":"EPH CP4 CombiPack4 OpenTherm RF Wireless Programmable Thermostat Pack — Boiler Plus Compliant — RFRP-OT RF1A-OT","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,Helvetica,sans-serif;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n  \u003cp style=\"margin:0 0 18px;\"\u003e\n    The \u003cstrong\u003eEPH CP4 CombiPack 4\u003c\/strong\u003e is a \u003cstrong\u003ewireless RF programmable room thermostat and boiler receiver pack\u003c\/strong\u003e, pre-paired out of the box and compliant with the UK's \u003cstrong\u003eBoiler Plus legislation\u003c\/strong\u003e. It comprises the \u003cstrong\u003eRFRP-OT thermostat\u003c\/strong\u003e and \u003cstrong\u003eRF1A-OT receiver\u003c\/strong\u003e — the thermostat sits on a wall or surface in the heated room; the receiver wires directly to the boiler's control terminals. Communication is wireless RF, removing the need to run a thermostat cable from boiler to living area. The CP4 supports four control modes — \u003cstrong\u003eOpenTherm®, TPI (Time Proportional Integral), Optimum Start, and On\/Off\u003c\/strong\u003e — making it compatible with both OpenTherm-capable boilers and standard on\/off boiler connections. \u003cstrong\u003e7-day, 5\/2-day and 24-hour programming\u003c\/strong\u003e, with six time\/temperature periods per day. Boost, Holiday mode, and Frost protection included as standard. Expandable to up to six zones via OpenTherm® using a hub receiver configuration.\n  \u003c\/p\u003e\n\n  \u003c!-- ── TEAL BOILER PLUS CALLOUT ──────────────────────────────────── --\u003e\n  \u003cdiv style=\"border-left:4px solid #008377CF;background:#e6f4f3;padding:10px 16px;margin-bottom:22px;border-radius:0 6px 6px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eℹ Boiler Plus Compliance\u003c\/strong\u003e\u003cbr\u003e\n    The UK's Boiler Plus regulations (Part L, Building Regulations) require that new and replacement gas combi boiler installations include a time and temperature control that meets minimum efficiency standards. The EPH CP4 satisfies this requirement through its \u003cstrong\u003eOpenTherm® modulation\u003c\/strong\u003e and \u003cstrong\u003eOptimum Start function\u003c\/strong\u003e — the two principal compliance routes. When connected to an OpenTherm-compatible boiler, the CP4 adjusts the boiler's actual flow temperature in response to real heat demand rather than simply switching it on\/off, reducing gas consumption and improving comfort.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eFeatures \u0026amp; Benefits\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:12px;background:#e6f4f3;padding:14px;border-radius:0 0 6px 6px;margin-bottom:22px;\"\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Pre-Paired — Wire In and Go\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe RFRP-OT thermostat and RF1A-OT receiver come \u003cstrong\u003epre-paired at the factory\u003c\/strong\u003e — there is no pairing procedure required on site. The receiver is wired to the boiler's OpenTherm or volt-free terminals and the system is operational immediately. This makes the CP4 one of the fastest wireless thermostat packs to commission, with no app download, account creation, or RF pairing steps needed at installation.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ OpenTherm® — Modulating Boiler Control\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eWhen wired to an OpenTherm-compatible boiler (the majority of modern gas combi and system boilers), the CP4 uses the \u003cstrong\u003eOpenTherm® protocol to modulate the boiler's output\u003c\/strong\u003e — instructing the boiler to run at a lower flow temperature when less heat is needed, rather than simply cycling it on\/off. This reduces fuel consumption, lowers return temperatures, improves condensing efficiency, and extends boiler lifespan by reducing thermal stress from frequent high-temperature cycling.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Optimum Start — Boiler Plus Compliant\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003e\n\u003cstrong\u003eOptimum Start\u003c\/strong\u003e calculates how early to fire the boiler so that the room reaches the programmed set temperature precisely at the scheduled time — not before (wasting energy) or after (causing discomfort). The CP4 learns the time required to raise the room temperature by 1°C and uses this to back-calculate the firing time, up to a maximum 3-hour lead time. This is a key \u003cstrong\u003eBoiler Plus compliance feature\u003c\/strong\u003e and also avoids the energy waste of a boiler running hard for 30 minutes before an occupied period.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Flexible Programming — 7-Day, 5\/2-Day, 24-Hour\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe thermostat supports \u003cstrong\u003ethree programming modes\u003c\/strong\u003e: 7-day (different schedule every day), 5\/2-day (weekday and weekend schedules), and 24-hour (same schedule repeated daily). Each mode allows up to \u003cstrong\u003esix time\/temperature switching periods per day\u003c\/strong\u003e, covering morning warm-up, occupied daytime, lunch return, evening, and setback periods. \u003cstrong\u003eBoost\u003c\/strong\u003e overrides the schedule for 1 hour; \u003cstrong\u003eHoliday mode\u003c\/strong\u003e sets a reduced temperature for a set number of days.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Expandable to 6 Zones via OpenTherm®\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe CP4 system can be \u003cstrong\u003eexpanded to control up to six independent heating zones\u003c\/strong\u003e from a single OpenTherm boiler by configuring one RF1A-OT receiver as a Hub Receiver. Additional RFRP-OT thermostats in each zone communicate wirelessly to the hub, which relays consolidated demand to the boiler via the single OpenTherm connection. Hot water control can also be added via the CP4-HW-OT accessory.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Smart-Ready — GW04 Gateway Upgrade Path\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eIf the homeowner wants to move to smart\/app-based control in the future, the \u003cstrong\u003eEPH GW04 gateway\u003c\/strong\u003e can be added to the existing CP4 installation — no rewiring or thermostat replacement required. The gateway provides Wi-Fi connectivity and access to EPH's app for remote temperature control and schedule adjustment from a smartphone. This makes the CP4 a low-risk choice that doesn't lock the homeowner into basic controls forever.\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;margin-bottom:8px;font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;width:44%;border-bottom:1px solid #c8e6e3;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eEPH Controls\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eProduct Code\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\n\u003cstrong\u003eCP4\u003c\/strong\u003e (CombiPack 4)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003ePack Contents\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eRFRP-OT (thermostat) + RF1A-OT (receiver) — pre-paired\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eControl Modes\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eOpenTherm®, TPI, Optimum Start, On\/Off\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eProgramming\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e7-day \/ 5\/2-day \/ 24-hour — up to 6 periods per day\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eTemperature Range\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e5°C – 35°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eSwitching Differential\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eAdjustable 0 – 1.0°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eSensor Type\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eNTC100K\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eSwitch Rating\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e8A 230Vac SPDT\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eThermostat Power\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e2 × AA batteries\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eReceiver Power\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eMains 230–240V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eIP Rating\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Zones\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eUp to 6 via OpenTherm® Hub Receiver configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eSmart Upgrade\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eEPH GW04 gateway (sold separately) — adds Wi-Fi\/app control\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;\"\u003eCompliance\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;\"\u003e\n\u003cstrong\u003eBoiler Plus compliant\u003c\/strong\u003e (UK Building Regulations Part L)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e","brand":"EPH Controls","offers":[{"title":"Default Title","offer_id":62767125037405,"sku":"CP4","price":67.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/EPH-CP4-OpenTherm-Programmable-Wireless-RF-Room-Thermostat.jpg?v=1771405044","url":"https:\/\/qualityheating.co.uk\/products\/eph-cp4-rf-programmable-thermostat-pack","provider":"AIZO Quality Heating","version":"1.0","type":"link"}