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I've inherited a house and I looking at options. It has E7 heating as when it was built there was no gas. There is gas and I've been playing with the online quote here. This comes up some rather strange figures. If I position the meter near the electric the cost is over £2k. If I put it as...

Update: I think I may have fixed it. It's hard to tell as it can go days without failing. The NRV at the tank didn't work and didn't seem to stop the air leak so it wasn't the oil falling back overnight that was the issue. I've changed the oil seals in the boiler fire/nrv valve and...

M.I. = Manufacturer's instructions? I checked with HRM before fitting the nv at the tank and they didn't see a problem. I would agree it does give some extra load to the oil pump but shouldn't be a lot compared with the force needed to push the oil through the nozzle.

Update for those following this thread. I replaced the NV valve. Still getting slow air leakage. I have some heldite on order and will try that as I'm not convinces the white stuff is working. What I have tried is ignoring the air bubble. It grows until it reaches a maximum size it...

Not sure I follow. The boiler is on a 15min cycle with a min run time of 4min (CM67 thermostat). The running sound is nice and steady. When I had a solenoid coil go intermittent you could hear the boiler burn sound vary. I don't hear that now. I haven't got a pressure gauge but the oil...

Solenoid valve stem hasn't been replaced. I did wonder about air getting back in from the pump is the pump solenoid valve was leaky. I looked at undoing the valve steam but it did want to move and didn't want to use too much force and break the pump (especially over xmas!). Is the valve...

Fittings are compression but system has been running fine for years. I've use a liquid ptfe (rated for oil) on the olives. It's a non set so perhaps I should get heldtight(?) or something instead? I've replaced the o rings in the old valve so when it stops raining I'll give that a try. I...

No, between swindon and bristol. But, the problem is the fact the fault is so intermittent. If an engineer comes out, HRM or not, the boiler is work fine. I've talked to HRM technical, they think the air bubble growing is suspicious as they say it should not do that.

Thanks for the suggestions. The fault is very intermittent. It can go days. So running with a small bottle of oil would show anything. I'd have to run for a couple of weeks like that. Solenoid coil has been changed. The air bubble isn't static but grows over days of running. The...

Control box is DKO 970 mod 21 and transformer is Bentone Danfoss Type EBI 052F0037 (as written on them) It's had a new nozzle. Front of nozzle is now black but I assume that is normal or maybe due to the air (or me getting rid of the air) causing burps? I assume combustion is ok. No sign...

Hi, I have a HRM wallstar 12/15 : 11 (Date 07/04 I reckon, installed late 2004). It has an intermittent fault where it sometimes fails to run requiring someone to go outside and push the red button (usually when it is raining!). There is a lot of air in the plastic pipe. I get rid of the...

Bit late but anyway. Just measured an aqualisa colt. Flow rate was 4.0l/min. I find this gives me an acceptable shower. I don't feel short of water. I dunno if this is because the head gives a wide coverage. Pipe run to the shower is 8m all in 22mm (2.4m to floor, 4.5m under floor, 1.1m...

If you want to be sure work out how much water you have in your system. Radiator maker's spec sheets will tell you how water they hold. You probably won't find old radiators so you'll have to make a guess, say 25% more water?? Same for pipes, guess water you have and work out. For my 5 bed...

It looks similar to a fluidmaster but it's not exactly the same as any of pictures on screwfix so it looks like a copy. I tried a flexible hose and that didn't help, or at least not by that much. I tried slowing down the fill by closing the service valve partly. Results were 50s fill...

Yes that is what it looks like. Form the pictures of Torbeck and fluidmaster I would have said it was fluidmaster. I suppose it might be worthwhile taking the valve apart to check there is no muck in, but I would have though that would give leaking or slow filling rather than making the action...

Cistern is a roper rhodes cascade. Dunno what valve that is.

So new cistern connected to cold water mains via plastic push fit and old copper pipe. New cistern valve seems to snap off rather than the slow close of ball valves. The creates a hammer more in the old pipe work which was "professionally" done when the house was built. That is supported and...

Perhaps I should have said I've measured the temperature drop across the boiler and adjusted the pump speed. Hence the 2 setting the pump is on is right. But FYI boiler is 15kW, there are 16 rads, total ~13.5kW and house loss at -1C works out as 7kW (system has evolved somewhat). Pipework...

Non return valves are quite useful. When I had a coal fired back boiler I had one inline with the pump. The pump opened it when it operated and when the pump stopped it was closed by its spring. It prevent gravity circulation in the pumped side. In this fully pumped oil fired system the...

It's oil fired, a HRM wallstar. Actually now I think I know what is going on I have a couple of solutions and I'll probably fit both. One is a check valve around the pump. I have one in system, but it comes from the vent pipe to pump output. I think it wants to be near the pump as once I...