Fly100

I’m interested in exploring the possibility of integrating and ASHP into my current system. Background New build property in 2017 @272 m2. 80% of the West walls are glass and very open, with little protection from the wind. Currently oil boiler, no mains gas. Ground floor is 172 m2 all under floor heating with 150mm insulation flow temps @ 40c Upstairs has radiators which are not used other than that to take the chill of the rooms and ( rads) sized with the ASHP in mind in the future. The house is very well insulated but very open with little protection from the wind. it was sized for 2 x 8.5kw ASHP. This would have resulted in more Planning Permission applications and after 3 years of battles with the locals we decided to put an oil boiler in and await ASPH Technology to improve to see if a single unit would ever emerge. I’m interested in some sort of Hybrid setup that would use the ASHP on the milder days with the Oil Boiler helping out when the ASHP cant provide the required heat output. Pipe dream or is this a possibility ? Thanks, FLY

I have 12 on my system and one appears to have gone faulty. Ive recalibrated them all on that zone but one remains operating with a mind of its own. It wont close fully, so when that zone is off there is still hot water flow. The pin inside the actuator does not appear to move far enough to close the flow. Ive emailed Salus last week, no reply as yet.

Yup got them on mine x12, that said 1 has gone faulty.

Mike, Where are you in the world. I have a Thermal Camera. Happy to assist if your not miles away for a Bacon bun and some Coffee. FLY

Worcester Bosch, Happy to hear any differnet views as im reviewing things at the minute. FLY

My house temps only drop 2 or 3 degrees over night depending on outside temps and wind direction. We are completley exposed to the West. Id dropped the temp down to 40c as we only need a small uplift in temps, thinking it would reduce the oil consumption slightly.

I was always under the impression its was 55c, but it would seem 47c for oil boilers. I will be happy to be corrected if incorrect.

I should have noted that is the Manifold Mix Valve Temp not the boiler flow temp. As an oil boiler does not modulate its output I wondered if this changed the utilization.

Hello all, After your thoughts on on Underfloor water temps. Im currently running at 40c but this is resulting in long warm up times. ( due to weather and house make up its only on once everyday). However if I was to turn it to 45c warm uptimes decrease obviously but there is extra energy being used to produce the extra temprature. Which is the most efficinet Im on an Oil boiler with no buffer tank and my return temps are well below the 47c mark for the boiler to condensate. Thanks in advance. FLY

Those dial stats are terribly inaccurate. They are potentially have a 3 degree spread over your target temperature.I would suggest switching to a decent Digital Stat. FLY

if you look back to page 1 that's what my box does. Basically it has a Temp sensor on the flow pipe 150mm from the boiler. Its currently set as a thermostat. The boiler runs and at 60C it stops running. Latent heat takes it upto to 63C, the pump continues to run. When the flow drops to 47C the boiler fires back up to 60C. Its reduced my boiler cycles to about 4 or 5 an hour. FLY

Yup checked that, valve is closing properly, im sure this is just water taking easiest route .Hence the gate valve to add some resistance and slow it down a little.

UFH set at 45c, with the hot water on its measuring 32c ish.

But its robbing 15C of flow temp from the underfloor heating. Sending cooler water into the UFH system that's counter productive.

Everything is working ok, its just the resistance of the Heating circuit is higher than the DHW. Hence the water is flying through the tank coil and not going to the Rads / Underfloor.

Worcester Oil Boiler, there are no valves in the boiler. Pipe run has valves ( 2 port ) on both the Heating Circuit and the DHW Circuit.

Had a few probs like this myself.Ive learnt a great deal. I aim to have my boiler flow 10-15 C above the UFH manifold setting, this has helped me out now end. You need to get that return temp down to below 47c or the boiler wont condense and you are losing a lot of efficiency. Have you tried altering the pump speeds? What was the old one set too ?

Hello, Need pointing in the right direction, my DHW tank is very close to the pump and boiler, however when the water is on most of the flow goes to the tank and the rest to the heating. The DHW tank is robbing the heating system as the water flow is takes the easiest path. Ive fitted a gate valve to slow the flow, but wonder what sort of flow / return differential i should be aiming for on the tank flows and returns.Is it the standard 20c like a boiler or is there another figure to use. Id like to ref a figure so I can than manage my system from that point, Im trying to achieve a decent balance of Heating and hot water by restricting the DHW tank flow. Thanks, FLY

Andy, Ive had a simular issue, however I only have on mandiflod from an Oil boiler. No mater what I did i could net get the flow above 2.5l/s. Various circuits closed etc. Slow warm up times followed with short cycling. Ive fitted the Salu Auto Balancing Actuators, this has greatly helped my problem, leaving me to thing the old accutator did not open fully. It would seem even a mm of lost movement can alter the flow. I understand this a slight curve ball, but have you tried removing the actuators completely ? FLY

Ive done a bit of research into these, in short the ASHP is used on the low demand days, cooler days use the ASHP and boiler mix and very cold days, Boiler only. Im currently researching adding and ASHP to my system to do similar to the above. A single ASHP does not meet my heat requirements but could certainly help out my heating requirements.

Interested to know how often your heating come on for the underfloor. I have an odd problem that Im not sure is a problem. Mine only fires once a day, call it a Charge up if you will. Its set to bring the ground floor of the house to 20c by about 7:30am. While I understand its not that cold yet mine is only coming on once a every 24hrs. My issue is that each time it comes on its a 'fresh start' from cold. The house is a new self build and the floors are 150mm in Kingspan then pipes and a 70mm screed and pretty well insulated with a large amount of glass. Each fresh start results in a boiler run time of approx 90-120 min using apporox 6 litres of Oil. How often does you boiler fire ? Thanks, FLY

As per topic really, do Actuators go on the Flow or Return of the Manifold? Appreciate your input. FLY

A friend of mine did this, he is currently installing Rads upstairs with hold in his nice new ceiling. Id install them, if only small ones but still do the work.

Have you seen an improvement / running cost reduction ?

I emailed Salus Tech Support yesterday and they say there are no issues and they will work. Fly