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Recent content by siricosm

  1. siricosm

    Dew point of gas-hydrogen blends

    Haha, yes, 15C.
  2. siricosm

    Dew point of gas-hydrogen blends

    Wow, that is a lot by the time you get to pure hydrogen, around 25C. This means that boiler running on pure hydrogen will not really need over sized rads to be condensing most of the time.
  3. siricosm

    Dew point of gas-hydrogen blends

    So although it may only change a small amount, it will be in the right direction as far as condensation is concerned, as the more hydrogen there is, the higher the return temperature can be, which is good. Still would be nice to see a table, that gives the temperature for various blends up to...
  4. siricosm

    T50 on new install?

    I have it mostly installed and I am just waiting for the heating season to end, and then I will switch it over. However, it will be while after that until I know how well the hot water performs in the winter, and what temperature I need to keep the cylinder. I should know right away if using a...
  5. siricosm

    Cast Iron Radiator Pressure Problems

    It is possible for a PRV to dribble after it has let by, and if that has happened it will likely need to be replaced. Have them check that when you get the external expansion tank added.
  6. siricosm

    Cast Iron Radiator Pressure Problems

    You don't need to drain the system to charge the expansion vessel, you just need to make sure there is no pressure on the wet side if you want to charge it to the correct pressure. I would get an external expansion vessel fitted. You mentioned before that the expansion vessel in your boiler is...
  7. siricosm

    Cast Iron Radiator Pressure Problems

    It is very unlikely that lack of inhibitor would create significant damage in a month, especially if the system is closed and started with inhibitor already. Is that heat exchanger now leaking? If so, it is more likely the exchanger was close to rotting through, and the additional pressure...
  8. siricosm

    Cast Iron Radiator Pressure Problems

    Does the pressure just cycle up and down as it warms and cools? or does it go down over time? There will be some variation in pressure from warm to cold. Did the installer fit an additional expansion vessel when the cast iron rads were added? As you noted, the expansion vessel in the boiler is...
  9. siricosm

    Range flowmax thermal store.

    If the store temperature started at 75C and after drawing 150 liters (avg 42.37C) it should drop to around 49C based on the numbers given. However, after 150 liters it was only producing 33C water at the relatively slow flow rate of 6l/min. This might suggest the heat exchanger is not working...
  10. siricosm

    Range flowmax thermal store.

    Sorry I was not so clear, I meant the final tank temperature after your experiment was finished, which I would estimate was a bit less than 50C. If my calculations are correct, then the coil in that tank is only operating at around 17kW (at T40), if one ignores any slight leakage through the...
  11. siricosm

    Range flowmax thermal store.

    Assuming the starting temperature was 75C, was the final temperature around 50C? Do you happen to know the flow rate when you did the experiment? Does anyone know the kW rating for the DHW coil in this tank?
  12. siricosm

    Dew point of gas-hydrogen blends

    With all this talk about potentially switching from gas to hydrogen or even blending some hydrogen into the gas, does anyone know how this affects the dew point of the products of combustion? With natural gas I think it starts to condense around 57C or so, so the return temperature needs to be...
  13. siricosm

    T50 on new install?

    Hee-hee, I am a bit farther along then that. I wound up going for a 300l Telford stainless buffer store, which was really inexpensive, and it came with a 3Kw backup immersion, dual stat and TPRV. I purchased a 165Kw Nordic-tec plate exchanger, so time will tell how high the store temperature...
  14. siricosm

    T50 on new install?

    Here you go, I found it: https://www.plumbersforums.net/threads/please-criticize-my-plan.111888/ I guess a lot of folks don't like thermal stores, so it a bit devolved into a discussion of pro/cons with unvented. The plan is to ditch the house thermostat, and have the rads controlled entirely...
  15. siricosm

    T50 on new install?

    My favorite are these (our house is 1930s): Deco Cast Iron Radiator - https://www.tradscastironradiators.co.uk/radiators/cast-iron-radiators/deco/ but I can't afford them, nor the ones in my profile pic. I was originally going to scrounge around for used ones, but then I found these ones which...
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