Grey Sage

I don't know what CT1 is, ProDave, but the good news is that the bugger is finally sealed. Two fibre washers, a whole roll of PTFE and then the entire thing packed round with "Leak and Repair Mastic" from Homebase. Thanks for the help, All The Grey Sage

Thanks again J1mbo. I'll take that on board. Do you have any experience with "eco-radiators? I think that they are supposed to flow through one panel first at the design temperature and the through the second panel. Sounds like a contravention of the laws of physics to me but the claim to be able to deliver more heat for a given flow temperature.

Ha ha. I know what you mean Steamy. It will be replaced with an UVC in a few months. Until then I just want to bodge it up to have hot water.

Thanks Marvin I'm going to try that this morning.

I don't think so. When it leaks it seems to leak from the top of the washers

Looking for advice from plumbers. I have an a ancient copper cylinder with a warped top and possibly crossed thread. It is due to be replaced in the next few months. Replacing a blown immersion heater I cannot get it to seal. It weep continually when I increase the water static head by filling the header tank,. I've tried PTFE on the thread, one and more fibre washers, plumber's mait, & guttter- sealant. Now I'm getting p****d off with it. I want fitted. it'll never have to come apart again - the heater will be scrapped, with the cylinder, in a few months. Are there any plumbers out there with a method for permanently sealing a recalcitrant immersion heater?

Thanks for that J1mbo. Can you see the excel file that I tried to upload with my question? The heat engineer used the existing radiator outputs based on 40oC compared to his calculated heat demand figures, implying that each radiator provides an average of less than half of the required heat. I don't know what temperature they operate at. I do know that they supply sufficient heat. Then he has specified a 35oC temperature and worked backwards to bigger radiators. My question is can the Vaillant reliably heat at 55oC (and a SCOP of 3.63 - better than Ecodan) those existing radiators to deliver the calculated heat requirements?

I have an installer who is fixated on an Ecodan 11.2kW with a flow temperature of 50oC and a SCOP of 3.3 (declared) but I like the look of a 12kW aroTHERM. My heat load calculations, done by a heat engineer that I trust, has suggested that 12 radiators need to be replaced to get the heat delivery of 12.6KW. My question is this: Would a 12kW aroTHERM deliver the heat at a higher flow temperature, and still have a SCOP to match the Ecodan, thereby allowing the existing radiators to be used? This would be an cost advantage for the aroTHERM but I need someone with more knowledge than me to show the calculations. TIA Copy of Radiator Schedule (004).xlsx

Played that game. At a flow temp of 500C I'm planning on replacing 12 radiators to give space heating of 31,313kWh/yr. DHW requirement is 6,340kWh/yr but some of that will be provided by solar PV. We produce an average of 3000kWh/year. At the moment I don't know what proportion of that we use. I plan to dedicate all of it to DHW either via an immersion or possibly via a Sunamp.

Played that game. At a flow temp of 500C I'm planning on replacing 12 radiators to give space heating of 31,313kW/yr.

That is the figure I've been working with. 75% efficiency gives18,750 kW/8 months. Typically we run the system beginning of September - end of April for all space heating and DHW. Remaining 4 months DHW is heated electrically. We also produce 3000kWh/year of Solar PV but I don't know what proportion of that we use and what is exported

Oopps. 57

A low D at a score of 75. I'm planning on adding 300mm of loft insulation onto a naked bit of loft to bring my average up to 200mm. The EPC quotes a "saving" of 471 kWh per year but, more to the point, I've been advised that not doing it will disqualify me from the RHI.

Yes. It corresponded very closely to my own calculations using the free MCS Excel spreadsheet from their website. He used a program called "Heat Engineer". The one thing that I didn't like about it was the different environmental data which meant that the "design external temperature" was -2.2. I think -3 is the industry standard.

I currently burn 3.1 tonnes of anthracite, in a season, at £410/tonne. Apparently that's about 12 tonnes of CO2! I agree that Octopus buy in renewable generation but would like to trust that they are actually selling what they claim. Better than some of the "offset" scams.