Brilliant explanation thank you. Just agreed to buy new house which has a regular boiler (10 years old) and was wondering if I should change to combi boiler. Food for thought.
Mine is a 3bed semi detached house with 2 showers and 9 heaters. Which is better for us combi or conventional? Our boiler stopped working and looking for a replacement
Hello, I’m seeking a piece of advice. We’ve 12 years old Conventional gas boiler at home we recently moved. There is no thermostat so we’ve to switch on/ switch off the boiler for heating. For hot water, there is a separate electric water heating system too. Is it advisable to get the thermostat for the heating system which is costing 250-300£ with installation? Many thanks
I have a pumped shower because our water pressure is poor. I gather than means we cant have a combi? Alternatively can a combi pump shower water itself?
Hi, love you channel , just picked up this vid, we have a heat only boiler in our 60's bungalow, only 2 hot water taps, 6 rads 2 of which are v small hot water tank is only 2 years old and well lagged. Everything says we should have a combi, BUT the system does not have any zone valves. My question that I cannot find the answer too is this, if I opt for a direct replacement of the heat only boiler will I have to have a 3 way valve fitted? If so why? Should I opt for a combi then given that you do online quotes how will you determine the level of extra work required? thanks Paul M
Hi Paul, glad you love the content! In response to your question, motorised valves (2 or 3 port) are a requirement under current building regs to allow for independent control of your heating and hot water circuits, so if you don't have one it would usually be the case that we would quote for a system controls upgrade. Under normal circumstances we would spot this from the pictures you provide when checking out with Heatable. Having said that, when we see systems that require controls upgrades it is usually the more cost-effective option to convert to a combi boiler (depending on the property and demand) as you mentioned, as usually installing new controls and wiring them up can be a lengthy and involved process!
I try not to install combi boilers when the BTU of the house is considerably lower than the domestic needs. I dont know about the UK but in the US most Combi boilers are 200,000 BTUs and of course the turndown ratio on most boilers is 10 to 1 based on the input. This means that the minimum firing rate is 20,000. Many newer homes are under 30,000 BTUs on a 0 degree day ( ). This allows for very little reset control and will cycle the boiler anytime the house load is less than 20,000. Cycle life and efficiency go out the window. A 50,000 BTU boiler will have a minimum firing rate of 5000 BTU and have much longer firing cycles throughout the winter months. A separate tankless water heater for the domestic will always offer the best value.
Hybrid Water Heater (heat pump) and a High Efficiency heating boiler.. 31 years Plumbing .. combi boilers are junk.. nobody wants to burn fuel for domestic water.. electricity is cheaper than any fuel and heat pump technology is the best for efficiency
