Case Study I was contacted by a homeowner near Coventry who wanted to replace their existing Myson Velaire 170,000 BTU (approx 50kW) boiler with something more efficient. The Velaire was becoming unreliable and also causing a stink in the Utility room and across the garden every time it fired up. It had also been shown to be producing significant levels of carbon monoxide.
This homeowner also wanted a new hot water cylinder, and so after a full property survey I suggested relocating both to their large garage, with a priority hot water setup for the new rapid-recovery 200L unvented cylinder and two heating zones, all on OpenTherm of course. Having carried out a full room-by-room heat loss survey of their property (as has been required under Part L of the Building Regulations since June 2022) I determined that their actual heat requirement was just 23.1kW, meaning that the existing Velaire was more than twice the power the property required. This must have wasted a huge amount of fuel and been very inefficient over the years!
I commenced the installation by flushing out the existing heating system with the old boiler still connected. Whilst the cleaning chemicals were circulating, the new cylinder was fitted in the garage and pipework installed to connect it into the system, before the existing one was removed. This meant my client had a continuous supply of hot water throughout the works, save for a period of around 2 hours draining down the old system and making connections to the new one. A secondary circulation system was added to the new hot water cylinder, providing near-instantaneous hot water to every outlet in the property. Previously it took quite some time for the taps to run hot! This secondary circulation system is controlled by motion sensors in the bathrooms, kitchen, and utility room, so that it only operates when it is actually required.
The cylinder was protected from scale with the installation of a Hydroflow HS38A electronic scale inhibitor, from which I have personally seen the benefits and always had excellent results.
Moving back to the heating system, once cleaning was complete the whole system was drained. We had agreed to fit new Thermostatic Radiator Valves to every radiator, and I specified the highly efficient and very accurate auto-balancing IMI Eclipse valves. These valves are pressure-independent, meaning that they will maintain the balance of the system even when some radiators are turned off or when the central heating pump modulates to match demand.
The new Sapphire boiler was positioned in the garage next to the cylinder, and installed with a Spirovent RV2 de-aerator & Magnaclean central heating filter. Removing air from a system using a full-flow de-aerator naturally helps to reduce corrosion. The Magnaclean will pick up any last vestiges of debris not captured during the cleaning process, as well as providing life-long protection to the boiler. Externally, a soakaway was dug to take the condensate, neatly hidden under a paving slab with a small access created for future maintenance. A high quality Specific Oil Solutions spin-on oil filter was added to the oil supply to protect the boiler from any sediment from the oil tank.
EPH CP4 & CP4-HW-OT controls were installed to ensure best efficiency. This particular client wanted app control and so the EPH GW03 dual-band gateway was installed, and the app set up to their requirements. The boiler was fully commissioned and demonstrated to be burning extremely cleanly & efficiently.
My delighted client was very happy to leave feedback on my Buy With Confidence page, stating “Detailed quote and quick response to our questions and queries. Always on time and approached the project in a methodical and logical fashion. Work tidy with emphasis on the details. Unforeseen issues resolved effectively with clear feedback. Thorough and detailed commissioning with all relevant paperwork, warranties etc. completed. Smart control systems all set up and the app enabled for us to use”. As my periodic OFTEC inspection was due, I was very happy to be able to show my inspector around this installation.