{"title":"Buffer Tanks","description":"","products":[{"product_id":"8-litre-expansion-vessel-safety-for-unvented-hot-water-systems","title":"8 Litre Expansion Vessel – Safety for Unvented Hot Water Systems","description":"\u003cb\u003e8 Litre Expansion Vessel – Safety for Unvented Hot Water Systems\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eThe 8 Litre Expansion Vessel is an essential safety component for any unvented hot water system. Designed for compatibility with TESY Hot Water Cylinders ranging from 30 to 150 litres, this expansion vessel ensures your installation remains safe, efficient, and compliant with UK regulations. Its robust capacity and compact footprint make it suitable for a wide range of domestic and light commercial applications.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eWhy Choose the 8 Litre Expansion Vessel?\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eThe 8 Litre Expansion Vessel is engineered to absorb excess pressure caused by water expansion during the heating cycle. By maintaining stable system pressure, it protects your pipework, appliances, and fittings from unnecessary stress and potential leaks. This vessel is a recommended addition for all unvented hot water installations, particularly when using TESY cylinders.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eKey Features\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eRobust Capacity: 8 litre volume, ideal for hot water systems with 30–150 litre cylinders.\u003cbr\u003eCompact Design: At just 345 mm in length and 190 mm in width, it fits easily into most airing cupboards or plant rooms.\u003cbr\u003eEasy Connection: 22 mm thread diameter for straightforward installation with standard pipework.\u003cbr\u003eQuality Construction: Manufactured to meet stringent UK safety standards for unvented systems.\u003cbr\u003eFlexible Mounting: No wall bracket required for most installations, keeping fitting simple and tidy.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eInstallation \u0026amp; Compliance\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eProper installation of an 8 Litre Expansion Vessel is required under UK Building Regulations G3 for any unvented hot water system. For best results, pair this vessel with a TESY hot water cylinder and a pressure relief valve to ensure full compliance and system safety. For installation accessories, browse our heating accessories.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery \u0026amp; Support\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eEnjoy free delivery to UK mainland addresses on all orders over £100. For non-mainland UK delivery or trade enquiries, please contact us before purchasing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAdditional Information \u003cbr\u003e\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eFREE Delivery:\u003c\/b\u003e Available on orders over £100. Next working day delivery is available for orders placed before 2 pm. Please \u003ci\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.modernheat.co.uk\/delivery-information\/\"\u003eclick here\u003c\/a\u003e\u003c\/b\u003e\u003c\/i\u003e to check delivery to your area.\u003cbr\u003e\u003cbr\u003eExplore \u003ci\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.modernheat.co.uk\"\u003eour full range of products\u003c\/a\u003e\u003c\/b\u003e\u003c\/i\u003e for more options that suit your home.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eNeed Assistance? \u003c\/b\u003eContact us for expert advice on \u003cb\u003e0161 439 1400.\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eLooking for reliable hot water cylinders, electric heating solutions, or technical support? \u003ci\u003e\u003cb\u003e\u003ca href=\"https:\/\/tesy.com\/\"\u003eVisit tesy.com\u003c\/a\u003e\u003c\/b\u003e\u003c\/i\u003e for full product information, technical documentation, and expert advice.","brand":"ModernHeatUK","offers":[{"title":"Default Title","offer_id":53767939424583,"sku":"8 Litre Safery Expansion Vessel - Model 8","price":34.79,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/0535\/7127\/files\/bc97b324-gqhnhqcode1.jpg?v=1776943622"},{"product_id":"buffer-tank-30-litres-4-port-cylinder-for-heat-pumps","title":"TESY Buffer Tank for Heat Pump Systems 30L | 4-Port Wall-Hung Insulated","description":"\u003cfont style=\"font-size: 13px;\"\u003e\u003cb\u003eTESY Buffer Tank for Heat Pump Systems 30L | 4-Port \u003c\/b\u003eis a compact buffer vessel designed to improve stability and efficiency in \u003cb\u003eheat pump heating systems\u003c\/b\u003e and other multi-source renewable setups. It provides reliable hydraulic separation and heat storage to help maintain steadier temperatures and consistent performance—especially in smaller installations where space is limited.\u003cbr\u003e\u003cbr\u003eWith \u003cb\u003efour ports (two inlets and two outlets)\u003c\/b\u003e and robust \u003cb\u003eG1 ½” metal connections\u003c\/b\u003e, it integrates cleanly into a range of heat pump system layouts, as well as biomass and solar thermal systems (as stated). A dedicated \u003cb\u003ethermo sensor pocket\u003c\/b\u003e supports accurate temperature monitoring and system optimisation.\u003cbr\u003e\u003cbr\u003eTo minimise heat loss, the tank is wrapped in \u003cb\u003e34mm INSUTECH insulation\u003c\/b\u003e and finished with a durable \u003cb\u003ewhite metal jacket\u003c\/b\u003e. It includes an integrated mounting plate for \u003cb\u003evertical wall installation\u003c\/b\u003e, plus an AV opening for added safety, with optional anti-condensation insulation on the fittings and the option to add an electric heating element for supplementary heating.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eKey features\u003c\/b\u003e\u003cbr\u003e\u003c\/font\u003e\u003cul\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eDesigned for heat pump systems: supports stable temperatures and efficient operation\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003e30L capacity: compact buffer volume for smaller installations\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003e4-port design: two inlets + two outlets for simple system integration\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eG1 ½” metal connections: designed for high flow rates (as stated)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eThermo sensor pocket: supports monitoring and optimisation\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eINSUTECH insulation (34mm): helps reduce heat loss and improve efficiency\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eVertical wall installation: integrated mounting plate for space-saving fitting\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eAV opening: added safety feature (as stated)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eOptional upgrades: anti-condensation insulation and electric heating element option\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eModern finish: white metal jacket for a clean, professional look\u003c\/font\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cb\u003e\u003cfont style=\"font-size: 13px;\"\u003eSpecifications\u003cbr\u003e\u003c\/font\u003e\u003c\/b\u003e\u003cul\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eCapacity: 30 litres\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eConnections: 4 ports (2 inlets, 2 outlets)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eConnection type\/size: G1 ½” metal connections\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eRated pressure: 6 bar\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eMaximum operational temperature: 95°C\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eEnergy class: B\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eInsulation: 34mm (INSUTECH technology)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eHeat losses (ΔT 45K): 32.1 W\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eDimensions: 386mm diameter\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eNet weight: 12kg\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eFinish: white metal jacket\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eMounting: vertical wall installation (integrated mounting plate)\u003c\/font\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cfont style=\"font-size: 13px;\"\u003e\u003cbr\u003e\u003cb\u003eInstallation \u0026amp; compliance\u003cbr\u003e\u003c\/b\u003eThis item must be installed by a qualified heating professional and specified correctly for your heat pump system design and flow requirements. Always follow the manufacturer’s instructions and ensure all fittings, valves, and safety components are selected to suit the system.\u003c\/font\u003e\u003cbr\u003e","brand":"ModernHeatUK","offers":[{"title":"Default Title","offer_id":53767940309319,"sku":"buffer-tank-30-4port","price":184.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/0535\/7127\/files\/5dbeb3a7-ru53f51qwss.jpg?v=1776943626"},{"product_id":"100-litres-buffer-tank-8-port-heat-pump-cylinder-wall-mounted","title":"TESY Buffer Tank for Heat Pump Systems 100L | 8-Port Wall-Hung Insulated","description":"\u003cfont style=\"font-size: 13px;\"\u003e\u003cb\u003eTESY Buffer Tank for Heat Pump Systems 100L | 8-Port\u003c\/b\u003e is a wall-mounted buffer vessel designed to improve stability and efficiency in\u003cb\u003e heat pump heating systems \u003c\/b\u003eand other renewable installations. It provides heat storage and hydraulic separation to help maintain steadier temperatures and consistent performance in domestic and commercial applications.\u003cbr\u003e\u003cbr\u003eWith \u003cb\u003eeight ports (four inlets and four outlets)\u003c\/b\u003e using robust\u003cb\u003e G1 ½” metal connections\u003c\/b\u003e, it’s ideal when you need flexible pipework—such as integrating two heat sources or running multiple circuits. Where all ports aren’t required, unused ports can be blanked off (as stated).\u003cbr\u003e\u003cbr\u003eFor monitoring and control, the tank includes \u003cb\u003etwo thermo sensor pockets\u003c\/b\u003e to support accurate temperature measurement and system optimisation. It’s wrapped in \u003cb\u003e32mm INSUTECH insulation\u003c\/b\u003e to help reduce heat loss, and finished with a durable \u003cb\u003ewhite metal jacket \u003c\/b\u003efor a clean plant-room look. An integrated mounting plate and supplied wall bracket support secure \u003cb\u003evertical wall installation\u003c\/b\u003e, with options to add anti-condensation insulation on fittings or an electric heating element for extra flexibility.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eKey features\u003cbr\u003e\u003c\/b\u003e\u003c\/font\u003e\u003cul\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eDesigned for heat pump systems: supports stable temperatures and efficient operation\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003e100L capacity: practical buffer volume for domestic and light commercial installs\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003e8-port design: four inlets + four outlets for flexible layouts and multiple circuits\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eG1 ½” metal connections: designed for high flow rates (as stated)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eUnused ports can be blanked off: ideal where 8 ports aren’t required (as stated)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eTwo thermo sensor pockets: supports monitoring and optimisation\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eINSUTECH insulation (32mm): helps reduce heat loss and improve efficiency\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eVertical wall installation: integrated mounting plate + wall bracket included (fixings not included)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eAV opening: added safety feature (as stated)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eOptional upgrades: electric heating element option + anti-condensation insulation option\u003c\/font\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cb\u003e\u003cfont style=\"font-size: 13px;\"\u003eSpecifications\u003cbr\u003e\u003c\/font\u003e\u003c\/b\u003e\u003cul\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eCapacity: 100 litres\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eConnections: 8 ports (4 inlets, 4 outlets)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eConnection type\/size: G1 ½” metal connections\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eThermo sensor pockets: 2\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eRated pressure: 6 bar\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eMaximum operational temperature: 95°C\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eEnergy class: C\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eInsulation: 32mm (INSUTECH technology)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eHeat losses (ΔT 45K): 61.3 W\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eDimensions: 470mm diameter\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eNet weight: 26kg\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eFinish: white metal jacket\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eMounting: vertical wall mounted\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont style=\"font-size: 13px;\"\u003eIncluded: wall bracket (fixings not included)\u003c\/font\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cfont style=\"font-size: 13px;\"\u003e\u003cb\u003eInstallation \u0026amp; compliance\u003cbr\u003e\u003c\/b\u003eThis buffer tank should be installed by a \u003cb\u003equalified heating professional\u003c\/b\u003e and specified correctly for your \u003cb\u003eheat pump system\u003c\/b\u003e design, flow requirements, and pipework layout. Always follow the manufacturer’s instructions and ensure all fittings, valves, and safety components are selected to suit the installation.\u003c\/font\u003e\u003cbr\u003e","brand":"ModernHeatUK","offers":[{"title":"Default Title","offer_id":53767940440391,"sku":"buffer-tank-100-8port","price":259.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0931\/0535\/7127\/files\/ee005beb-krix5yfqbxd.jpg?v=1776943625"}],"url":"https:\/\/www.modernheat.co.uk\/collections\/buffer-tanks.oembed","provider":"Modern Heat","version":"1.0","type":"link"}