Knowledge Base & Product Guides
Your comprehensive resource for heating and hot water solutions. This knowledge base contains expert guidance, technical documentation, and practical advice for all Flexiheat UK products including boilers, water heaters, air curtains, unit heaters, and MVHR systems.
Whether you’re a homeowner, installer, or commercial facility manager, you’ll find detailed information on:
From 50kW combi boilers and commercial water heaters to industrial air curtains and portable heating solutions, our knowledge base provides the technical expertise and practical guidance you need to make informed decisions. This helps you maintain optimal performance from your Flexiheat UK heating systems.
For additional support beyond our knowledge base, contact our expert team at 01202 822221 or sales@flexiheatuk.com
What is the most energy efficient boiler UK? The most energy efficient boilers in the UK are electric boilers, no ifs or buts. Just a fact. They are 100% energy efficient boilers, with all the energy that is supplied to the immersion heaters in the boilers directly converted into heat output for the heating system. […]
Electric boilers for hot water only? In the world of home heating, terminology matters. As a heating supply company, we frequently encounter confusion between “electric boilers for hot water only” and standard electric domestic hot water heaters. This misunderstanding can lead to incorrect purchases, poor system design, and costly mistakes. Let’s clear the air once […]
How efficient are electric boilers? How efficient are electric boilers? Well, the answer is at point of use, electric boilers are 100% energy efficient at the immersion heaters, turning all of the electricity they consume into usable heat. Could you please explain why they are sometimes quoted as being 99% to 100% energy efficient? Although virtually […]
Direct Pressurised Hot Water Cylinders for Efficient Domestic Hot Water Heating Direct pressurised hot water cylinders are the most popular electric powered water heater or electric heating hot water system on the UK market. Introduction to direct hot water cylinders Direct hot water cylinders heat water using electrical immersion heaters within the cylinder itself. Direct […]
Buffer Vessel Sizing for Hydronic Heating Systems Buffer vessels are essential components in hydronic heating systems, providing thermal storage capacity that improves system efficiency, reduces equipment cycling, and enhances overall performance. Proper sizing of these vessels is critical to achieving optimal system operation. This guide covers the principles, calculations, and considerations necessary for correctly sizing […]
Pressurised hot water cylinders – what are they? Pressurised hot water cylinders, also known as unvented cylinders, are storage tanks that supply pressurised hot water to homes without relying on gravity as they take water directly from the mains. These systems are connected directly to the mains water supply; thus, they are a pressurised system, […]
Boiler low gas pressure? Boiler low gas pressure? Some boilers have problems with not having enough gas pressure. These problems aren’t always dangerous or common, but they can happen, especially in newer heating systems and result in low gas pressure to your boiler. This is more noticeable when an installer or service worker goes […]
Can I fit a waste or multi oil burner to my existing boiler? A Kroll KG/UB waste or multi oil burner from Flexiheat UK is a great way to significantly reduce your heating costs. With its ability to burn almost any used oils from waste engine oils and hydraulic oils to used vegetables oils and […]
A Chilled Water Buffer Tank Sizing Guide for Optimal System Performance If you’re looking for the best approach to sizing a chilled water buffer tank or vessel, you’ve most likely seen chillers cycle because the buffer vessel or tank is too small. Have you ever been annoyed by temperatures that fluctuate as your load changes? […]
For your heat pump system, is a thermal buffer tank necessary? A buffer vessel, sometimes referred to as a buffer tank or thermal storage tank, is an element that enhances the performance and efficiency of most air source heat pump (ASHP) systems. In essence, the buffer vessel is a thermal reservoir comprised of a tank […]
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