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  1. Jock Spanners

    Can I fit a modern radiator to a gravity fed radiator?

    Evening All, I turned up to change a radiator last week only to find an ancient rad connected to a big old steel one pipe system with no return. Is it possible to connect a modern rad and valves? Would I need to pipe it top to bottom? There's copper tails coming off the steel pipe tees. Thanks...
  2. Jock Spanners

    Two houses but only one boiler?

    Evening All, I have a customer who wants a modern oil boiler fitting to replace his ancient one. The big problem is he's divided his house into two with a holiday cottage next door. I'm not sure but surely that's against Building Regs and he needs two boilers?. Can anyone advise me? Thanks, Jock
  3. Jock Spanners

    How do I bend oil pipe?

    Evening All, We've just moved into gas boilers (after years doing gas) and are currently tooling up. On our first install we had problems bending the 10mm plastic coated, white pipe. Possibly because of the sub-zero conditions the covering shattered when we bend it by hand. It measures 12mm...
  4. Jock Spanners

    Are designer, column type radiators bi-directional?

    Evening all, A customer has shown me some designer, flat column type radiators she wants me to fit. On the bottom they are marked 'in' and 'out' which I assume means flow and return. Does anyone know if it makes any difference which way the flow and return is connected? I don't imagine it does...
  5. Jock Spanners

    What type of non-return valve for a 22mm heating return pipe?

    Good Morning All, I've just got a customer with a heating fault from their system boiler. When they turned off their heating for the summer they found the upstairs rads were still getting warm when they heated hot water. The boiler is in the corner of the kichen with all the pipework in the...
  6. Jock Spanners

    Advice needed on sealing a vented system

    Evening All, I have an unusual customer who is bit of a recyling nut. Last year we installed a heat only boiler (only after it died) and changed all his downstairs rads. It's only a small 3 bedroom house but for some reason he resisted getting a combi. Now he's having a loft extension there's...
  7. Jock Spanners

    Has anyone ever used leak sealer in a boiler?

    Evening All, I have a customer with a 13 year old Potterton 25 combi. It's weeping from the hydraulic assembly. I suspect a hairline crack in the plastic block. I've costed a replacement and it's about £400 which she can't afford at the moment. It's losing about half a cup a day. I'm wondering...
  8. Jock Spanners

    Can I heat a vented cylinder with an empty coil?

    Evening All, I've dug myself into a hole due to being too busy and there being shortages of kit. Basically the Megaflow unvented cylinder I ordered last year has been delayed for three weeks and I cracked on changing the boiler thinking I could at least instal the boiler. So I'd put in a...
  9. Jock Spanners

    Unvented cylinder discharge into gulley connected to soakaway

    Good afternoon everyone, I'm having problems siting an unvented cylinder. The best solution I can see is to put it in the customer's garage but there's no drain nearby. I could easily discharge it through the wall, install a gulley and link it to a soakaway under the lawn. Have any of you ever...
  10. Jock Spanners

    Can I have two combis or do I need a commercial boiler?

    Evening All, A customer of mine asked me to help installing a new boiler in his holiday cottage. It turns out to be one of a pair of Viessman combis installed in a chapel conversion. There's two 30kW combis and a range cooker all fed by one 22mm pipe and G6 meter. The gas pipe runs up to the...
  11. Jock Spanners

    Has anyone fitted a hybrid ASHP/solar thermal/unvented cylinder system with gas boiler back up?

    Good Afternoon All, This is my first time on the renewables forum so please forgive my ignorance. I've been interested in ASHPs for about 15 years but have always doubted their economic viability - especially for retrofits. Now that there will be no gas connected to new builds in 4 years I am...
    • Jock Spanners
    • Thread
    • boiler cylinder system thermal unvented unvented cylinder
    • Replies: 9
    • Forum: Boilers
  12. Jock Spanners

    How can I protect boilers in outhouses?

    Evening all, I have an interesting problem. I look after twelve alms houses that had Vaillant Ecotec combis installed about three years ago by some national company. They were installed in the old single brick wall coal houses which have no roof insulation - just slates. Being a charity, run by...
  13. Jock Spanners

    Potterton Promax gas pressure problem

    Evening All, I've been defeated by a Potterton Promax combi today and I'm a sore loser! When there's a demand for heat it lights with an explosive ignition then it immediately shuts off and then repeats in a continuous cycle on/off. There's no fault code, the spark gap is correct and all...
  14. Jock Spanners

    To seal a central heating system or not?

    Good morning everyone, I have a big old vicarage which needs a new regular boiler. They also want fancy mixer taps in the kitchen . They have two hot water cylinders linked together, a shower pump and curved old radiators in the bay windows. I'm agonizing over what to do. The easiest option is...
  15. Jock Spanners

    There's treasure in your toilet and it can help the planet

    Good afternoon everyone. Like most of you I'm now confined to quarters and surfing the net. On a lighter note I came across this from the BBC: There's treasure in your toilet Jock
  16. Jock Spanners

    What's the worst boiler job?

    Evening all, I didn't get in until 7 o'clock this evening thanks to yet another Worcester hydroblock removal job. I was asking myself what I'd done to deserve two in one week. Why you have to virually dismantle a whole boiler just to change a PRV is beyond me. It set me thinking about what...
  17. Jock Spanners

    Where's the best place to site a heating expansion vessel?

    Evening all, I'm converting a regular boiler to a sealed system and unvented cylinder. The Megaflow is in the bathroom and the boiler downstairs high on a wall. I'm running the cylinder vent to the soil stack. I'm struggling to decide where to put the expansion vessel on the heating. It's an s...
  18. Jock Spanners

    Is this a blocked primary heat exchanger?

    Evening all, What a nightmare day I've just had! I got called to a house yesterday where the tennants were complaining that the downstairs rads were only luke warm. It's a long, thin, terraced house with the DuoTec at the back in a bedroom. The boiler was kettling, shutting down and restarting...
  19. Jock Spanners

    Getting heat to the furthest radiator in a long house

    Evening all, I need a second opinion on a heating problem before I tackle it. I have a customer with a long, thin terraced house. He has a large combi at the back upstairs. His problem is that the downstairs front room rad never gets warm enough. The rads are mainly piped in 15mm apart from the...
  20. Jock Spanners

    Are TRVs mandatory when fitting a new boiler in 2019?

    Evening all, Could someone please clarify this question for me? My interpretation of the current situation is that since Boiler Plus omitted to reintroduce the requirement that all new boiler installs need TRVs on the rads it has been recognised by the EU EPBD and the Government's Domestic...
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