{"id":27407,"date":"2026-09-15T09:00:13","date_gmt":"2026-09-15T09:00:13","guid":{"rendered":"https:\/\/www.turnbull.co.uk\/cms\/?p=27407"},"modified":"2026-09-15T13:29:38","modified_gmt":"2026-09-15T13:29:38","slug":"our-guide-to-central-heating-radiators","status":"publish","type":"post","link":"https:\/\/www.turnbull.co.uk\/cms\/information\/our-guide-to-central-heating-radiators\/","title":{"rendered":"Our Guide to Central Heating Radiators"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\"><p>[vc_row][vc_column][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Whether you are upgrading an existing central heating system or remodeling a room, navigating the different radiator options can quickly feel overwhelming.<\/p>\n<p style=\"text-align: center;\">This introductory guide breaks down everything you need to know about different types of radiators, standard radiator sizes, and heat output considerations.<\/p>\n<p style=\"text-align: center;\">Estimated reading time: 3.5 minutes<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator border_width=&#8221;2px&#8221; accent_color=&#8221;#FF9900&#8243;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1740481318304{background-color: #C2C2C200 !important;}&#8221;][vc_single_image image=&#8221;27466&#8243; img_size=&#8221;large&#8221; alignment=&#8221;center&#8221;][\/vc_column][vc_column width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1740481293684{border-color: #C2C2C200 !important;}&#8221;][vc_column_text]<\/p>\n<h2>Understanding How Central Heating Radiators Work<\/h2>\n<p>At their core, central heating radiators act as heat exchangers. Hot water from your boiler or heat pump circulates through the unit, warming the metal structure via two primary methods:<\/p>\n<ul>\n<li><strong>Radiant Heat:<\/strong> Warms objects, furniture, and surfaces directly in front of the unit.<\/li>\n<li><strong>Convection Currents:<\/strong> Pull cool air from the floor, warm it over internal fins, and circulate it back into the room.<\/li>\n<\/ul>\n<p>To maximize performance, modern units feature internal corrugated metal sheets called convector fins. A convector radiator increases surface area for heat transfer without expanding the outer footprint of the panel, making it a highly popular choice for efficient heating in modern homes.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator style=&#8221;dotted&#8221; border_width=&#8221;2&#8243; color=&#8221;orange&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h2>The Main Types of Radiators Explained<\/h2>\n<p>When comparing panel radiator types, you will frequently see two-digit numbers like type 11, type 21, type 22, and type 33 radiators. These numbers explain the internal build:<\/p>\n<ul>\n<li><strong>First digit:<\/strong> The number of water-filled radiator panels.<\/li>\n<li><strong>Second digit:<\/strong> The number of rows of convector fin sets welded inside.<\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;27411&#8243; img_size=&#8221;large&#8221; alignment=&#8221;center&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator style=&#8221;dotted&#8221; border_width=&#8221;2&#8243; color=&#8221;orange&#8221;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;27470&#8243; img_size=&#8221;600&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\">Type 11 Radiators<br \/>\n(Single Panel, Single Convector)<\/h3>\n<p style=\"text-align: center;\">Type 11 radiators consist of a single front panel and one set of convector fins. Because a single panel radiator features only one water plate, it maintains an extremely slim profile, ideal for narrow hallways, small cloakrooms, or tight spaces behind doors.<\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;27472&#8243; img_size=&#8221;600&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\">Type 21 Radiators<br \/>\n(Double Panel, Single Convector)<\/h3>\n<p style=\"text-align: center;\">A type 21 radiator features two outer panels with a single set of convector fins between them. This offers a slimmer profile than a full double-convector unit while yielding noticeably more warmth than a single panel radiator.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;27474&#8243; img_size=&#8221;600&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\">Type 22 Radiators<br \/>\n(Double Panel, Double Convector)<\/h3>\n<p style=\"text-align: center;\">Type 22 radiators feature two water panels and two sets of internal convector fins. They represent the standard choice for most modern living rooms, primary bedrooms, and open-plan spaces, delivering substantial heat without taking up excessive wall length.<\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;27473&#8243; img_size=&#8221;600&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\">Type 33 Radiators<br \/>\n(Triple Panel, Triple Convector)<\/h3>\n<p style=\"text-align: center;\">Type 33 radiators offer three panels and three sets of convector fins. Designed specifically for larger rooms, high-ceiling spaces, or areas with high heat loss, they yield maximum heat output when wall width is restricted.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator style=&#8221;dotted&#8221; border_width=&#8221;2&#8243; color=&#8221;orange&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2>Type 21 vs Type 22 Radiator: Key Differences<\/h2>\n<p>Choosing between a type 21 vs type 22 radiator comes down to balancing depth constraints against required heat output:<\/p>\n<ul>\n<li><strong>Heat Output:<\/strong> Type 22 radiators produce roughly 20% to 30% more heat than a type 21 radiator of the same dimensions.<\/li>\n<li><strong>Wall Depth:<\/strong> Type 21 units sit closer to the wall for tight walkways.<\/li>\n<li><strong>Energy Efficiency:<\/strong> Type 22 models warm up larger rooms much faster, allowing your thermostat to satisfy setpoints sooner.<\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator style=&#8221;dotted&#8221; border_width=&#8221;2&#8243; color=&#8221;orange&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2>Exploring Other Distinct Radiator Types<\/h2>\n<p>Beyond standard panel designs, several distinct types of radiators match specific architectural styles:[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_single_image onclick=&#8221;custom_link&#8221; image=&#8221;{&#8220;27476&#8220;:{&#8220;url&#8220;:&#8220;https:\/\/www.zehnder-radiators.co.uk\/radiators\/zehnder-roda&#8220;,&#8220;title&#8220;:&#8220;&#8220;,&#8220;target&#8220;:&#8220;_blank&#8220;,&#8220;rel&#8220;:&#8220;&#8220;}}&#8221; img_size=&#8221;400&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\">Designer and Vertical Radiators<\/h3>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Available in bold finishes, turning standard heating into an architectural focal point. Tall, wall-mounted units that utilize vertical space rather than horizontal length.<\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/3&#8243;][vc_single_image onclick=&#8221;custom_link&#8221; image=&#8221;{&#8220;27478&#8220;:{&#8220;url&#8220;:&#8220;https:\/\/www.zehnder-radiators.co.uk\/radiators\/zehnder-roda-spa-asym?fuel=electric&#8220;,&#8220;title&#8220;:&#8220;&#8220;,&#8220;target&#8220;:&#8220;_blank&#8220;,&#8220;rel&#8220;:&#8220;&#8220;}}&#8221; img_size=&#8221;400&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><strong>Electric Radiators<\/strong><\/h3>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;11px&#8221;][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Operate independently of the main boiler system for homes without a gas connection or for single room extensions.<\/p>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;27481&#8243; img_size=&#8221;400&#215;400&#8243; alignment=&#8221;center&#8221;][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><strong>Column Radiators<\/strong><\/h3>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;11px&#8221;][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Feature tubular vertical columns that suit traditional or industrial decor and hold heat exceptionally well.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=&#8221;0px&#8221; css_animation=&#8221;none&#8221; css=&#8221;.vc_custom_1789467316492{background-image: url(https:\/\/www.turnbull.co.uk\/cms\/app\/uploads\/2026\/09\/banner-lincoln-showroom-2.jpg) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221;][vc_column width=&#8221;1\/2&#8243;][\/vc_column][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789467151811{background-color: #DCDCDC !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_column_text]<\/p>\n<h2 style=\"text-align: center; color: #000e77;\">Looking for Designer Radiators?<\/h2>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<p style=\"text-align: center; color: #000e77;\">As proud stockists of Zehnder central heating and electric radiators, our expert team is here to help you select the ideal model, size, and output for your heating project.<\/p>\n<p style=\"text-align: center; color: #000e77;\">Drop into your local Turnbull showroom for friendly, tailored advice.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;Find your Nearest Showroom&#8221; align=&#8221;center&#8221; custom_background=&#8221;#FF9900&#8243; custom_text=&#8221;#fff&#8221; gradient_color_1=&#8221;turquoise&#8221; gradient_color_2=&#8221;blue&#8221; link=&#8221;url:https%3A%2F%2Fwww.turnbull.co.uk%2Fshowrooms%2Fvisit%2F|title:Extra&#8221; el_class=&#8221;branch-button&#8221; custom_hover_background=&#8221;#f5b14b&#8221; custom_hover_text=&#8221;#f7f7f7&#8243; custom_border=&#8221;#FF9900&#8243; custom_hover_border=&#8221;#f5b14b&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2>Radiator Sizes and Standard Dimensions<\/h2>\n<p>Choosing the correct radiator size is critical for both aesthetic appeal and practical warmth.<\/p>\n<p>Manufacturers offer standard radiator sizes designed to match typical wall dimensions:<\/p>\n<ul>\n<li><strong>Heights:<\/strong> Standard heights range from 300mm to 900mm (600mm is most common below windows).<\/li>\n<li><strong>Widths:<\/strong> Standard widths range from 400mm up to 3000mm in panel designs.<\/li>\n<li><strong>Depths:<\/strong> Protrusion ranges from 50mm (type 11 radiators) up to 160mm+ (type 33 radiators).<\/li>\n<\/ul>\n<p>Leave at least 100mm of clearance between the floor and the bottom of the unit, plus 50mm above it for smooth air convection.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator style=&#8221;dotted&#8221; border_width=&#8221;2&#8243; color=&#8221;orange&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2>Sizing and Output: Why Heat Loss and BTU Ratings Matter<\/h2>\n<p>Before buying based solely on physical radiator size, check BTU ratings (British Thermal Units) or kilowatt outputs to match the room&#8217;s heat loss (factoring in room dimensions, window glazing, and insulation quality).[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator border_width=&#8221;2px&#8221; accent_color=&#8221;#F7BE68&#8243;][\/vc_column][\/vc_row][vc_row gap=&#8221;0px&#8221; css_animation=&#8221;none&#8221; css=&#8221;.vc_custom_1789400808522{background-color: #FFFFFF !important;}&#8221;][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789400628642{background-color: #DCDCDC !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_single_image image=&#8221;27332&#8243; img_size=&#8221;400&#215;250&#8243; alignment=&#8221;center&#8221;][\/vc_column][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789400821153{background-color: #FFFFFF !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_column_text]<\/p>\n<h2 style=\"text-align: center; color: #000e77;\"><strong>Simply matching your old radiator dimensions isn&#8217;t always enough.<\/strong><\/h2>\n<p style=\"text-align: center; color: #000e77;\">Before making a purchase, check out our BTU Calculator guide to determine the\u00a0 BTU ratings and output required for every room in your house.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;What Radiator Size Do I Need?&#8221; align=&#8221;center&#8221; custom_background=&#8221;#FF9900&#8243; custom_text=&#8221;#fff&#8221; gradient_color_1=&#8221;turquoise&#8221; gradient_color_2=&#8221;blue&#8221; link=&#8221;url:https%3A%2F%2Fwww.turnbull.co.uk%2Fcms%2Finformation%2Fbtu-calculator-for-radiators%2F|title:Extra&#8221; el_class=&#8221;branch-button&#8221; custom_hover_background=&#8221;#f5b14b&#8221; custom_hover_text=&#8221;#f7f7f7&#8243; custom_border=&#8221;#FF9900&#8243; custom_hover_border=&#8221;#f5b14b&#8221;][\/vc_column][\/vc_row][vc_row gap=&#8221;0px&#8221; css_animation=&#8221;none&#8221; css=&#8221;.vc_custom_1789400725505{background-color: #FFFFFF !important;}&#8221;][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789400741507{background-color: #FFFFFF !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_column_text]<\/p>\n<h2 style=\"text-align: center; color: #000e77;\">Even the most efficient convector radiator wastes energy if left running uncontrolled.<\/h2>\n<p style=\"text-align: center; color: #000e77;\">Check out our step-by-step guide on How to Fit a TRV to upgrade your system control in an afternoon.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;How To Fit A Thermostatic Radiator Valve&#8221; align=&#8221;center&#8221; custom_background=&#8221;#FF9900&#8243; custom_text=&#8221;#fff&#8221; gradient_color_1=&#8221;turquoise&#8221; gradient_color_2=&#8221;blue&#8221; link=&#8221;url:https%3A%2F%2Fwww.turnbull.co.uk%2Fcms%2Finformation%2Fhow-to-fit-a-thermostatic-radiator-valve%2F|title:Extra&#8221; el_class=&#8221;branch-button&#8221; custom_hover_background=&#8221;#f5b14b&#8221; custom_hover_text=&#8221;#f7f7f7&#8243; custom_border=&#8221;#FF9900&#8243; custom_hover_border=&#8221;#f5b14b&#8221;][\/vc_column][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789400174275{background-color: #DCDCDC !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_single_image image=&#8221;27372&#8243; img_size=&#8221;400&#215;300&#8243; alignment=&#8221;center&#8221;][\/vc_column][\/vc_row][vc_row gap=&#8221;0px&#8221; css_animation=&#8221;none&#8221; css=&#8221;.vc_custom_1789400854257{background-color: #FFFFFF !important;}&#8221;][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789399894476{background-color: #DCDCDC !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_single_image image=&#8221;27451&#8243; img_size=&#8221;400&#215;300&#8243; alignment=&#8221;center&#8221;][\/vc_column][vc_column css_animation=&#8221;none&#8221; width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1789400757234{background-color: #FFFFFF !important;}&#8221; offset=&#8221;vc_col-xl-inherit vc_col-lg-inherit vc_col-md-6 vc_col-sm-inherit&#8221;][vc_column_text]<\/p>\n<h2 style=\"text-align: center; color: #000e77;\">Even the best radiators can run into issues where they stay cold at the top, feel cold at the bottom, or fail to heat up entirely.<\/h2>\n<p style=\"text-align: center; color: #000e77;\">Read our Troubleshooting Cold Radiator Problems guide to diagnose cold spots and restore full heat output<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;Why Are My Radiators Not Getting Hot?&#8221; align=&#8221;center&#8221; custom_background=&#8221;#FF9900&#8243; custom_text=&#8221;#fff&#8221; gradient_color_1=&#8221;turquoise&#8221; gradient_color_2=&#8221;blue&#8221; link=&#8221;url:https%3A%2F%2Fwww.turnbull.co.uk%2Fcms%2Finformation%2Fwhy-are-my-radiators-not-getting-hot%2F|title:Extra&#8221; el_class=&#8221;branch-button&#8221; custom_hover_background=&#8221;#f5b14b&#8221; custom_hover_text=&#8221;#f7f7f7&#8243; custom_border=&#8221;#FF9900&#8243; custom_hover_border=&#8221;#f5b14b&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator border_width=&#8221;2px&#8221; accent_color=&#8221;#F7BE68&#8243;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center; color: #000e77;\" data-start=\"72\" data-end=\"122\"><strong data-start=\"72\" data-end=\"120\">Looking for Type 11 and Type 22 radiators?<\/strong><\/h2>\n<h3 style=\"text-align: center; color: #000e77;\" data-start=\"124\" data-end=\"375\">Browse our range online<\/h3>\n<p style=\"text-align: center; color: #000e77;\">Kartell K-Rad and Purmo radiators can be ordered online at your convenience, with free local delivery.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;Browse our Radiators&#8221; align=&#8221;center&#8221; custom_background=&#8221;#FF9900&#8243; custom_text=&#8221;#fff&#8221; gradient_color_1=&#8221;turquoise&#8221; gradient_color_2=&#8221;blue&#8221; link=&#8221;url:https%3A%2F%2Fwww.turnbull.co.uk%2Fcategory%2Fplumbing-and-heating%2Fradiators-valves%2Fradiators|title:Extra&#8221; el_class=&#8221;branch-button&#8221; custom_hover_background=&#8221;#f5b14b&#8221; custom_hover_text=&#8221;#f7f7f7&#8243; custom_border=&#8221;#FF9900&#8243; custom_hover_border=&#8221;#f5b14b&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator border_width=&#8221;2px&#8221; accent_color=&#8221;#F7BE68&#8243;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>An introductory guide to central heating radiators. 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