{"product_id":"uceder-hot-tub-heater-lx-h20-rs1-110-120v-2-kw-inline-thermostat-compact-retrofit-for-400-gal-spas","title":"UCEDER Hot Tub Heater LX H20-Rs1 110-120V 2 kW Inline Thermostat — Compact Retrofit for ≤400 gal Spas","description":"\u003cp\u003e\u003cstrong\u003eUCEDER Hot Tub LX H20-Rs1 is a compact 110–120V, 2 kW inline spa heater designed to raise and maintain water temperature in small bathtubs, portable spas and hot tubs with up to about 400 US gallons of water.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis inline thermostat heater is built for retrofit or aftermarket spa upgrades where a low-voltage, energy-efficient heating element is needed. It connects directly to a circulating pump and requires a dedicated 20A circuit; the unit ships without a plug and has three wires for permanent connection. Designed for straightforward installation when matched with the correct pump, plumbing and electrical supply, the LX H20-Rs1 focuses on reliable, compact performance rather than high-capacity commercial heating.\u003c\/p\u003e\n\n\u003ch3\u003eHow much water can this 2 kW heater effectively warm?\u003c\/h3\u003e\n\u003cp\u003eThe LX H20-Rs1 performs best in small to medium home tubs and portable spas. UCEDER recommends a maximum water capacity of about 400 US gallons; exceeding that can prevent the heater from reaching or holding set temperatures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaximum recommended capacity: ~400 US gallons\u003c\/li\u003e\n  \u003cli\u003eNot intended for large commercial pools or oversized hot tubs\u003c\/li\u003e\n  \u003cli\u003eHeating time depends on pump flow and ambient temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat electrical and plumbing setup do I need to install the heater?\u003c\/h3\u003e\n\u003cp\u003eInstall the heater on a dedicated 20A circuit and provide a 1.5\" outlet for the inline connection. The unit requires a minimum water pressure (0.35 MPa) and works with pumps that deliver sufficient flow and horsepower.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVoltage: 110–120V (2 kW) with a 20A breaker or adapter\u003c\/li\u003e\n  \u003cli\u003eWiring: three wires — black (live), white (neutral), green (ground)\u003c\/li\u003e\n  \u003cli\u003ePlumbing: 1.5\" outlet and minimum 0.35 MPa pressure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich pump and flow specs are recommended for reliable operation?\u003c\/h3\u003e\n\u003cp\u003eA pump that produces steady flow and at least 200 watts (approximately 3600 L\/h) is advised. Undersized pumps or insufficient flow will trigger safety features or prevent the heater from engaging.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuggested pump power: ≥200 W\u003c\/li\u003e\n  \u003cli\u003eSuggested flow: approximately 3600 L\/h or higher\u003c\/li\u003e\n  \u003cli\u003eIncorrect pump sizing can cause no-heat conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow can I troubleshoot if the heater doesn’t operate?\u003c\/h3\u003e\n\u003cp\u003eUCEDER provides simple inspection steps: check mount direction, verify wiring, confirm flow and pressure, and use a multimeter to isolate faulty components. The package includes pictorial guidance for detecting heating element damage and testing four diagnostic points.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm arrow on unit matches water flow direction\u003c\/li\u003e\n  \u003cli\u003eUse a multimeter to test the four diagnostic terminals\u003c\/li\u003e\n  \u003cli\u003ePhotograph installation, pump, set temperature and water volume for support\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The UCEDER LX H20-Rs1 is aimed at homeowners, DIY installers and technicians refurbishing compact hot tubs, portable spas or small bathtubs who need a low-voltage, space-saving inline heater. It’s a practical choice when you have a compatible pump, a dedicated 20A circuit and plumbing with a 1.5\" outlet. If you operate a large commercial tub or require high-speed rapid heating for large volumes, consider a higher-capacity model instead.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the heater include a plug?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The unit has three bare wires (black live, white neutral, green ground) and requires hardwiring to a 20A circuit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this heat a 500-gallon tub?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. UCEDER recommends not exceeding about 400 US gallons for effective heating with this 2 kW unit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"UCEDER","offers":[{"title":"Default Title","offer_id":56839716012372,"sku":"B07K46FWKN","price":154.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/uceder-front-unit-overview.jpg?v=1787068233","url":"https:\/\/gardenluxe.co.uk\/products\/uceder-hot-tub-heater-lx-h20-rs1-110-120v-2-kw-inline-thermostat-compact-retrofit-for-400-gal-spas","provider":"Gardenluxe Uk","version":"1.0","type":"link"}